{"Author (year)":"Adkins (1937)","Description of the sample":"High school sample","Country":"USA","n":77,"Intelligence test":"Point Subject Ratio","Grade level":8,"rxyi":0.56,"rxxi":0.89}
{"Author (year)":"Agnoli et al. (2012)","Description of the sample":"Bolognia sample","Country":"Italy","n":352,"Intelligence test":"Raven's Progressive Matrices","Type of intelligence test":"Nonverbal","Grade level":4,"Gender":43.4,"Age":9.4,"rxyi":0.38,"rxxi":0.8}
{"Author (year)":"Al-Ghamri (2012)","Description of the sample":"Arab sample I","Country":"Yemen","n":682,"Intelligence test":"Otis-Lennon Mental Ability Test","Grade level":10,"Gender":48,"Age":16.9,"rxyi":0.81,"rxxi":0.83}
{"Author (year)":"Al-Ghamri (2012)","Description of the sample":"Arab sample II","Country":"Yemen","n":466,"Intelligence test":"Otis-Lennon Mental Ability Test","Grade level":11,"Gender":48.1,"Age":16.9,"rxyi":0.81,"rxxi":0.83}
{"Author (year)":"Al-Ghamri (2012)","Description of the sample":"Arab sample III","Country":"Yemen","n":413,"Intelligence test":"Otis-Lennon Mental Ability Test","Grade level":12,"Gender":50.6,"Age":16.9,"rxyi":0.8,"rxxi":0.83}
{"Author (year)":"Allana (2010)","Description of the sample":"Private School sample I","Country":"Dubai","n":15,"Intelligence test":"Raven's Standard Progessive Matrices","Type of intelligence test":"Nonverbal","Grade level":5,"Age":9.5,"rxyi":0.98,"rxxi":0.87}
{"Author (year)":"Allana (2010)","Description of the sample":"Private School sample II","Country":"Dubai","n":15,"Intelligence test":"Raven's Standard Progressive Matrices","Type of intelligence test":"Nonverbal","Grade level":6,"Age":9.5,"rxyi":0.88,"rxxi":0.87}
{"Author (year)":"Ames (1943)","Description of the sample":"1939 sample","Country":"USA","n":256,"Intelligence test":"Otis S-A Intelligence Test","Type of intelligence test":"Mixed","Grade level":9,"rxyi":0.59}
{"Author (year)":"Ames (1943)","Description of the sample":"1940 sample","Country":"USA","n":277,"Intelligence test":"Otis S-A Intelligence Test","Type of intelligence test":"Mixed","Grade level":9,"rxyi":0.59}
{"Author (year)":"Ames (1943)","Description of the sample":"1941 sample","Country":"USA","n":281,"Intelligence test":"Otis S-A Intelligence Test","Type of intelligence test":"Mixed","Grade level":9,"rxyi":0.54}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":93,"Intelligence test":"Performance Test System 1-2 (German version); Intelligenz-Struktur-Test 2000 R","Grade level":13,"rxyi":0.23,"rxxi":0.97}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":58,"Intelligence test":"Performance Test System 1-2(German version); Intelligenz-Struktur-Test 2000 R","Grade level":13,"rxyi":0.24,"rxxi":0.97}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":1508,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Type of intelligence test":"Nonverbal","Grade level":5,"Gender":49,"Age":10.9,"rxyi":0.25,"rxxi":0.87,"ux":1.13}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":529,"Intelligence test":"Culture Fair Intelligence Test-20 (German adaptation)","Type of intelligence test":"Nonverbal","Grade level":3,"Gender":49.2,"Age":8.9,"rxyi":0.33,"rxxi":0.9,"ux":1.13}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":718,"Intelligence test":"Culture Fair Intelligence Test-20 (German adaptation)","Type of intelligence test":"Nonverbal","Grade level":3,"Gender":49.5,"Age":9.5,"rxyi":0.35,"rxxi":0.9,"ux":1.12}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":700,"Intelligence test":"Culture Fair Intelligence Test-20 (German adaptation)","Type of intelligence test":"Nonverbal","Grade level":4,"Gender":48.9,"Age":10.4,"rxyi":0.36,"rxxi":0.9,"ux":1.07}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":710,"Intelligence test":"Culture Fair Intelligence Test-20 (German adaptation)","Type of intelligence test":"Nonverbal","Grade level":5,"Gender":49.5,"Age":11.4,"rxyi":0.33,"rxxi":0.9,"ux":1.08}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":715,"Type of intelligence test":"Verbal","rxyi":0.25}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":1389,"Intelligence test":"Berlin Structure of Intelligence Test for Youth: Assessment of Talent and Giftedness","Type of intelligence test":"Mixed","Grade level":9,"Gender":59,"Age":14.5,"rxyi":0.29,"rxxi":0.74,"ux":0.69}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":85,"Intelligence test":"Berlin Structure of Intelligence Test","Type of intelligence test":"Mixed","Grade level":11,"Gender":46.5,"Age":16.7,"rxyi":0.44,"rxxi":0.83,"ux":0.55}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":277,"Intelligence test":"Analyse des Schlussfolgernden und Kreativen Denkens","Type of intelligence test":"Verbal","Grade level":12,"Gender":61.1,"Age":17.6,"rxyi":0.46,"rxxi":0.89,"ux":0.66}
{"Author (year)":"Anonymous","Description of the sample":"Anonymous sample","n":312,"Intelligence test":"Wonderlic Personal Test (German version)","Type of intelligence test":"Verbal","Grade level":12,"Gender":59.9,"Age":17.4,"rxyi":0.07,"rxxi":0.9,"ux":0.66}
{"Author (year)":"Aswal (2001)","Description of the sample":"P.I.C. Tehri College students sample","Country":"India","n":65,"Intelligence test":"General Mental Ability Group Test by Jolata and Singh","Grade level":11,"rxyi":0.58}
{"Author (year)":"Aswal (2001)","Description of the sample":"G.G.I.C. Tehri College students sample","Country":"India","n":25,"Intelligence test":"General Mental Ability Group Test by Jolata and Singh","Subject domain":"Mathematics and Science","Grade level":11,"rxyi":0.61}
{"Author (year)":"Aswal (2001)","Description of the sample":"V.H.S. Koti College students sample","Country":"India","n":50,"Intelligence test":"General Mental Ability Group Test by Jolata and Singh","Subject domain":"Mathematics and Science","Grade level":11,"rxyi":0.39}
{"Author (year)":"Aswal (2001)","Description of the sample":"G.I.C. Pokhal College students sample","Country":"India","n":35,"Intelligence test":"General Mental Ability Group Test by Jolata and Singh","Subject domain":"Mathematics and Science","Grade level":11,"rxyi":0.46}
{"Author (year)":"Aswal (2001)","Description of the sample":"G.I.C. Sirai College students sample","Country":"India","n":25,"Intelligence test":"General Mental Ability Group Test by Jolata and Singh","Subject domain":"Mathematics and Science","Grade level":11,"rxyi":0.35}
{"Author (year)":"Axelsson (2009)","Description of the sample":"Sweden sample","Country":"Sweden","n":124,"Intelligence test":"Raven's Progressive matrices; Deltatest -- submodule Number Series","Subject domain":"Mathematics and Science","Gender":100,"Age":29.9,"rxyi":0.5}
{"Author (year)":"Barton, Dielman, and Cattell (1971)","Description of the sample":"Sixth grade sample","Country":"USA","n":169,"Intelligence test":"Culture Fair Intelligence Test","Type of intelligence test":"Nonverbal","Grade level":6,"Gender":50,"rxyi":0.43}
{"Author (year)":"Barton et al. (1971)","Description of the sample":"Seventh grade sample","Country":"USA","n":142,"Intelligence test":"Culture Fair Intelligence Test","Type of intelligence test":"Nonverbal","Grade level":7,"Gender":50,"rxyi":0.49}
{"Author (year)":"Beckett, Castle, Rutter, and Sonuga-Barke (2010)","Description of the sample":"GCSE-sample","Country":"Great Britain","n":161,"Intelligence test":"Wechsler Intelligence Scale for Children","Age":15,"rxyi":0.64,"rxxi":0.97,"ux":1.09}
{"Author (year)":"Bipp, Steinmayr, and Spinath (2012)","Description of the sample":"Goal orientation sample","Country":"Germany","n":164,"Intelligence test":"Intelligenz Struktur Test 2000 R","Type of intelligence test":"Mixed","Grade level":11,"Gender":53.1,"Age":16.5,"rxyi":0.35,"rxxi":0.89,"ux":0.84}
{"Author (year)":"Bloeschl (1966)","Description of the sample":"Bloeschl's sample","Country":"Germany","n":125,"Intelligence test":"Performance Test System (German version); Hamburger-Wechsler-Intelligence Test for Children","Gender":41.6,"Age":10.9,"rxyi":-0.03,"rxxi":0.92}
{"Author (year)":"Blue (2009)","Description of the sample":"Blue's sample","Country":"USA","n":452,"Intelligence test":"Cognitive Abilities Test","Grade level":7,"Gender":50.7,"rxyi":0.32,"rxxi":0.95}
{"Author (year)":"Bose (1982)","Description of the sample":"Calcutta sample","Country":"India","n":250,"Intelligence test":"Culture Fair Intelligence Test","Type of intelligence test":"Nonverbal","rxyi":0.18,"rxxi":0.9}
{"Author (year)":"Bouffard, Vezeau, Roy, and Lengele (2011)","Description of the sample":"Quebec sample","Country":"Canada","n":462,"Intelligence test":"Mental Ability Test (French version)","Type of intelligence test":"Mixed","Gender":43.3,"Age":8.6,"rxyi":0.77,"rxxi":0.85}
{"Author (year)":"Boulon-Diaz (1992)","Description of the sample":"Puerto Rican sample","Country":"USA","n":65,"Intelligence test":"Wechsler Intelligence Scale for Children -- Revised, Puerto Rican version","Type of intelligence test":"Mixed","Grade level":5,"Age":10,"rxyi":0.66,"rxxi":0.89}
{"Author (year)":"Bowers (1966)","Description of the sample":"Bowers' sample","Country":"USA","n":278,"Intelligence test":"Otis Quick Scoring Mental Ability Test","Type of intelligence test":"Mixed","Grade level":9,"rxyi":0.57,"rxxi":0.86,"ux":0.77}
{"Author (year)":"Bratko, Chamorro-Premuzic, and Saks (2006)","Description of the sample":"Bratko et al.'s sample","Country":"Croatia","n":255,"Intelligence test":"Multifactor Test Battery; Serial Numbers; Surface Development Test-Vz 3; Adaptation of Thurstone First Letter Test","rxyi":0.49,"rxxi":0.91}
{"Author (year)":"Brucks (1978)","Description of the sample":"Hollfeld sample","Country":"Germany","n":185,"Intelligence test":"Frankfurter Analogietest 4-6","Type of intelligence test":"Mixed","Grade level":5,"Gender":54.6,"Age":11,"rxyi":0.61,"rxxi":0.93}
{"Author (year)":"Burgert (1937)","Description of the sample":"San Diego sample","Country":"USA","n":191,"Intelligence test":"Terman Group Test","Grade level":6,"rxyi":0.48,"rxxi":0.93,"ux":0.86}
{"Author (year)":"Carter (1959)","Description of the sample":"Grade 11 small California High School sample","Country":"USA","n":116,"Intelligence test":"Hemnon-Nelson Intelligence Test","Type of intelligence test":"Verbal","Grade level":11,"rxyi":0.66}
{"Author (year)":"Carter (1959)","Description of the sample":"Grade 11 large California High School sample","Country":"USA","n":239,"Intelligence test":"ACE Intelligence Test","Grade level":10,"rxyi":0.53}
{"Author (year)":"Carter (1959)","Description of the sample":"Grade 11 California High School sample","Country":"USA","n":211,"Intelligence test":"ACE Intelligence Test","Grade level":10,"rxyi":0.5}
{"Author (year)":"Chamorro-Premuzic, Quiroga, and Colom (2009)","Description of the sample":"Madrid sample","Country":"Spain","n":248,"Intelligence test":"Raven's Advanced Progressive Matrices; Solid figures; Primary Mental Ability Battery; Differential Aptitude Test Battery","Gender":81,"Age":20.1,"rxyi":0.01}
{"Author (year)":"Cocking and Holy (1927)","Description of the sample":"Iowa sample","Country":"USA","n":266,"Intelligence test":"Thorndike Intelligence Examination for High School Graduates","Gender":40.2,"rxyi":0.42,"rxxi":0.92}
{"Author (year)":"Cooper (1974)","Description of the sample":"Ottawa sample","Country":"Canada","n":527,"Intelligence test":"Hemnon-Nelson Tests; Differential Aptitude Test","Grade level":10,"rxyi":0.2}
{"Author (year)":"Craig (1988)","Description of the sample":"Craig's sample","Country":"USA","n":105,"Intelligence test":"Test of Cognitive Skills","rxyi":0.5,"rxxi":0.81}
{"Author (year)":"Daley et al. (2005)","Description of the sample":"Female sample","Country":"Kenya","n":243,"Intelligence test":"Adaptation of the Peabody Picture Vocabulary Test; Adaptation of the Wechsler Intelligence Scale for Children -- Revised","Grade level":1,"rxyi":0.34}
{"Author (year)":"Daley et al. (2005)","Description of the sample":"Male sample","Country":"Kenya","n":234,"Intelligence test":"Adaptation of the Peabody Picture Vocabulary Test; Adaptation of the Wechsler Intelligence Scale for Children -- Revised","Grade level":1,"Age":7.5,"rxyi":0.4}
{"Author (year)":"Dash, Mohanty, and Kar (1989)","Description of the sample":"Orissa sample","Country":"India","n":60,"Intelligence test":"Compound-Stimulus Visual Information Test; Serial-Stimulus Visual Information Test; Forward Digit Span Test; Backward Digit Span Test; Adaptation of the Wechsler Intelligence Scale for Children: Similarities subtest & Vocabulary subtest; Raven's Colored Progressive Matrices; Wechsler Intelligence Test: Block Design subtest","Grade level":5,"Age":10,"rxyi":0.31,"rxxi":0.82}
{"Author (year)":"Day, Hanson, Maltby, Proctor, and Wood (2010)","Description of the sample":"A-level sample","Country":"GB","n":129,"Intelligence test":"Raven's Progressive Matrices","Type of intelligence test":"Nonverbal","Gender":59.7,"Age":18.6,"rxyi":0.43,"rxxi":0.92}
{"Author (year)":"Di Fabio and Palazzeschi (2009)","Description of the sample":"Toscana sample","Country":"Italy","n":124,"Intelligence test":"Advanced Progressive Matrices","Type of intelligence test":"Nonverbal","Gender":72.6,"Age":17.5,"rxyi":0.32,"ux":1.09}
{"Author (year)":"Dodonova and Dodonov (2012)","Description of the sample":"Moscow sample","Country":"Russia","n":184,"Intelligence test":"Raven's Advanced Progressive Matrices; Intelligence-Structure-Test","Gender":62,"Age":16,"rxyi":0.19,"ux":0.74}
{"Author (year)":"Downey, Lomas, Billings, Hansen, and Stough (2013)","Description of the sample":"Victoria sample","Country":"Australia","n":243,"Intelligence test":"Raven's Standard Progressive Matrices","Type of intelligence test":"Nonverbal","Grade level":9,"Gender":100,"Age":14.6,"rxyi":0.46,"ux":1.44}
{"Author (year)":"Dresel, Fasching, Steuer, and Berner (2010)","Description of the sample":"Dresel et al.'s sample","Country":"Germany","n":796,"Intelligence test":"Culture Fair Test-20x","Type of intelligence test":"Nonverbal","Subject domain":"Languages","Grade level":4,"Gender":54,"Age":9.8,"rxyi":0.23,"rxxi":0.69,"ux":0.74}
{"Author (year)":"Duckworth, Quinn, and Tsukayama (2012)","Description of the sample":"Texas sample I","Country":"USA","n":706,"Intelligence test":"Wechsler Abbreviated Scale of Intelligence","Type of intelligence test":"Mixed","Grade level":8,"Gender":48,"rxyi":0.48,"ux":0.96}
{"Author (year)":"Duckworth et al. (2012)","Description of the sample":"Texas sample II","Country":"USA","n":510,"Intelligence test":"Raven's Progressive Matrices","Type of intelligence test":"Nonverbal","Age":11.7,"rxyi":0.41,"rxxi":0.8}
{"Author (year)":"Edds and McCall (1933)","Description of the sample":"Edd and McCall's sample","Country":"USA","n":85,"Intelligence test":"Otis Group Intelligence Scale","Type of intelligence test":"Mixed","rxyi":0.32}
{"Author (year)":"Edminston and Rhoades (1959)","Description of the sample":"Edminston and Rhoades's sample","Country":"USA","n":94,"Intelligence test":"California Test of Mental Maturity","Type of intelligence test":"Mixed","rxyi":0.56}
{"Author (year)":"Falch and Sandgren Massih (2011)","Description of the sample":"Malmo sample","Country":"Sweden","n":637,"Intelligence test":"Raven's Matrices","Type of intelligence test":"Nonverbal","Grade level":3,"Gender":0,"Age":15,"rxyi":0.62,"rxxi":0.8}
{"Author (year)":"Fischbach, Baudson, Preckel, Martin, and Brunner (2013)","Description of the sample":"MAGRIP sample","Country":"Luxembourg","n":1601,"Intelligence test":"Performance Test System (German version)","Type of intelligence test":"Mixed","Grade level":6,"Gender":49.7,"Age":11.9,"rxyi":0.51,"rxxi":0.83}
{"Author (year)":"Fischer, Schult, and Hell (2013)","Description of the sample":"Female sample","Country":"Germany","n":232,"Intelligence test":"Intelligenz-Struktur-Test 2000 R","Type of intelligence test":"Mixed","Grade level":13,"Gender":100,"Age":20.3,"rxyi":0.37,"rxxi":0.9,"ux":0.62}
{"Author (year)":"Fischer et al. (2013)","Description of the sample":"Male sample","Country":"Germany","n":220,"Intelligence test":"Intelligenz-Struktur-Test 2000 R","Type of intelligence test":"Mixed","Grade level":13,"Gender":0,"rxyi":0.43,"rxxi":0.9,"ux":0.64}
{"Author (year)":"Flere, Krajnc, Klanjsek, Musil, and Kirbi (2010)","Description of the sample":"Flere et al.'s sample","Country":"Slovenia","n":1308,"Intelligence test":"POGACIK Test","Type of intelligence test":"Nonverbal","Gender":48.9,"Age":17,"rxyi":0.48,"rxxi":0.84}
{"Author (year)":"Frandsen (1950)","Description of the sample":"Frandsen's sample","Country":"USA","n":83,"Intelligence test":"Wechsler-Bellevue; Henmon-Nelson","Grade level":12,"Age":17,"rxyi":0.6,"rxxi":0.87,"ux":0.8}
{"Author (year)":"Freudenthaler et al. (2008)","Description of the sample":"Female sample","Country":"Austria","n":779,"Intelligence test":"Intelligenz-Struktur-Analyse","Type of intelligence test":"Mixed","Grade level":8,"Gender":100,"Age":14.5,"rxyi":0.55,"rxxi":0.84}
{"Author (year)":"Freudenthaler et al. (2008)","Description of the sample":"Male sample","Country":"Austria","n":526,"Intelligence test":"Intelligenz-Struktur-Analyse","Type of intelligence test":"Mixed","Grade level":8,"Gender":0,"Age":14.5,"rxyi":0.53,"rxxi":0.84}
{"Author (year)":"Freund and Holling (2011)","Description of the sample":"Matrices sample","Country":"Germany","n":646,"Intelligence test":"MatrixDeveloper","Type of intelligence test":"Nonverbal","Grade level":10,"Gender":34,"Age":15.7,"rxyi":0.36,"rxxi":0.74}
{"Author (year)":"Freund, Holling, and Preckel (2007)","Description of the sample":"Freund et al.'s sample","Country":"Germany","n":1135,"Intelligence test":"Berlin Structure of Intelligence Test for Youth: Assessment of Talent and Giftedness","Type of intelligence test":"Mixed","Gender":46.2,"Age":14.5,"rxyi":0.48,"rxxi":0.89}
{"Author (year)":"Friedhoff (1955)","Description of the sample":"Female Boone sample","Country":"USA","n":48,"Intelligence test":"Otis Quick Scoring Mental Ability Test; Science Research Associates Test of Primary Mental Abilities","Grade level":7,"Gender":100,"rxyi":0.61,"rxxi":0.88,"ux":0.86}
{"Author (year)":"Friedhoff (1955)","Description of the sample":"Male Boone sample","Country":"USA","n":59,"Intelligence test":"Otis Quick Scoring Mental Ability Test; Science Research Associates Test of Primary Mental Abilities","Grade level":7,"Gender":0,"rxyi":0.49,"rxxi":0.88,"ux":0.96}
{"Author (year)":"Friedhoff (1955)","Description of the sample":"Female Mason City sample","Country":"USA","n":103,"Intelligence test":"Otis Quick Scoring Mental Ability Testx; Science Research Associates Test of Primary Mental Abilities","Grade level":7,"Gender":100,"rxyi":0.5,"rxxi":0.88,"ux":0.9}
{"Author (year)":"Friedhoff (1955)","Description of the sample":"Male Mason City sample","Country":"USA","n":99,"Intelligence test":"Otis Quick Scoring Mental Ability Test; Science Research Associates Test of Primary Mental Abilities","Grade level":7,"Gender":0,"rxyi":0.51,"rxxi":0.88,"ux":0.96}
{"Author (year)":"Furnham and Monsen (2009)","Description of the sample":"South East of England sample","Country":"Great Britain","n":265,"Intelligence test":"Wonderlic Personnel Test; Baddeley Reasoning Test","Type of intelligence test":"Verbal","Grade level":10,"Gender":41.3,"Age":15.6,"rxyi":0.35,"rxxi":0.86}
{"Author (year)":"Furnham, Monsen, and Ahmetoglu (2009)","Description of the sample":"Furnham et al.'s Sample","Country":"Great Britain","n":212,"Intelligence test":"Wonderlic Personnel Test","Type of intelligence test":"Mixed","Grade level":10,"Gender":58,"Age":15.8,"rxyi":0.49,"rxxi":0.9,"ux":1}
{"Author (year)":"Gagne and St. Pere (2002)","Description of the sample":"Greater Montreal sample","Country":"Canada","n":156,"Intelligence test":"Raven's Progressive Matrices; Otis-Lennon Mental Ability Test","Grade level":8,"Gender":100,"Age":13.5,"rxyi":0.46,"rxxi":0.87}
{"Author (year)":"Ghosh (1960)","Description of the sample":"1956 sample","Country":"India","n":120,"Intelligence test":"Viva","Grade level":3,"Gender":0,"rxyi":0.29,"rxxi":0.54}
{"Author (year)":"Ghosh (1960)","Description of the sample":"1957 sample","Country":"India","n":120,"Intelligence test":"Viva","Grade level":3,"Gender":0,"rxyi":0.39,"rxxi":0.54}
{"Author (year)":"Gilles and Bailleux (2001)","Description of the sample":"Gilles and Bailleux's sample","Country":"France","n":122,"Intelligence test":"Culture Fair Test: subtest 3; Ability Factor Battery: Numerical Addition subtest, Mental Rotation subtest","Grade level":6,"Gender":49.2,"Age":12,"rxyi":0.27,"rxxi":0.88}
{"Author (year)":"Gralewski and Karwowski (2012)","Description of the sample":"Creativity sample","Country":"Poland","n":589,"Intelligence test":"Raven's Progressive Matrices","Type of intelligence test":"Nonverbal","Grade level":3,"Gender":51.8,"Age":17.6,"rxyi":0.15,"rxxi":0.85}
{"Author (year)":"Hartlage and Steele (1977)","Description of the sample":"Hartlage and Steele's sample","Country":"USA","n":36,"Intelligence test":"Wechsler Intelligence Scale; Wechsler Intelligence Scale for Children -- Revised","Type of intelligence test":"Mixed","Gender":32,"Age":8,"rxyi":0.59,"rxxi":0.89}
{"Author (year)":"Hartson (1939)","Description of the sample":"Ohio sample","Country":"USA","n":2121,"rxyi":0}
{"Author (year)":"Haugwitz, Nesbit, and Sandmann (2010)","Description of the sample":"Biology sample","Country":"Germany","n":248,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Subject domain":"Mathematics and Science","Gender":56,"Age":13.9,"rxyi":0.17,"rxxi":0.73,"ux":0.68}
{"Author (year)":"Heaven and Ciarrochi (2012)","Description of the sample":"Sydney sample","Country":"Australia","n":786,"Intelligence test":"Standardized Australian test","Type of intelligence test":"Mixed","Grade level":10,"Gender":53.2,"rxyi":0.46}
{"Author (year)":"Hinkelman (1955)","Description of the sample":"Hinkelman's sample","Country":"USA","n":29,"Intelligence test":"Kuhlmann-Anderson intelligence rating","Gender":50,"rxyi":0.57}
{"Author (year)":"Hintsanen et al. (2012)","Description of the sample":"Helsinki sample","Country":"Finnland","n":309,"Intelligence test":"Three standardized tests","Subject domain":"Mathematics and Science","Grade level":8,"Gender":46.6,"Age":15,"rxyi":0.62,"rxxi":0.74}
{"Author (year)":"Hofer, Kuhnle, Kilian, and Fries (2012)","Description of the sample":"Bielefeld sample","Country":"Germany","n":697,"Intelligence test":"Berlin Structure of Intelligence Tes: Reasoning subtest","Type of intelligence test":"Mixed","Grade level":8,"Gender":52,"Age":13.4,"rxyi":0.34,"rxxi":0.68}
{"Author (year)":"Irwin, Engle, Yarbrough, Klein, and Townsend (1978)","Description of the sample":"Female sample","Country":"Guatemala","n":125,"Intelligence test":"Adaptation of the 22-test INCAP Preschool Battery","Gender":100,"Age":7,"rxyi":0.34}
{"Author (year)":"Irwin et al. (1978)","Description of the sample":"Male sample","Country":"Guatemala","n":130,"Intelligence test":"Adaptation of the 22-test INCAP Preschool Battery","Gender":0,"Age":7,"rxyi":0.42}
{"Author (year)":"Johnson and McGowan (1984)","Description of the sample":"Houston Parent-Child Development Center sample","Country":"USA","n":51,"Intelligence test":"Stanford-Binet; McCarthy Scales of Childrens Ability; Wechsler Intelligence Scale for Children -- Revised","rxyi":0.17,"rxxi":0.9}
{"Author (year)":"Johnson (1967)","Description of the sample":"Minnesota sample","Country":"USA","n":126,"Intelligence test":"Lorge-Thorndike Intelligence Test","Type of intelligence test":"Mixed","rxyi":0.63}
{"Author (year)":"Johnson, Deary, and Iacono (2009)","Description of the sample":"Twin sample","Country":"Germany","n":1648,"Intelligence test":"Wechsler Intelligence Scale for Children -- Revised","Type of intelligence test":"Mixed","Gender":53.8,"Age":11,"rxyi":0.4,"rxxi":0.97,"ux":0.92}
{"Author (year)":"Jordan (1922)","Description of the sample":"Arkansas sample","Country":"USA","n":67,"Intelligence test":"Otis; Army Alpha; Miller; Terman","rxyi":0.47,"rxxi":0.94}
{"Author (year)":"Kanderian (1970)","Description of the sample":"Kanderian's sample","Country":"Iraq","n":304,"Intelligence test":"Cattell Culture Fair Intelligence Test; Modification of Thurstone Primary Mental Abilities","Grade level":6,"rxyi":0.3,"rxxi":0.86}
{"Author (year)":"Karbach, Gottschling, Spengler, Hegewald, and Spinath (2013)","Description of the sample":"Cosmos sample","Country":"Germany","n":334,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision (German version); Wechsler Intelligence Scale-III","Gender":50.6,"Age":12.4,"rxyi":0.38}
{"Author (year)":"Kaufman et al. (2010)","Description of the sample":"Implicit sample","Country":"Great Britain","n":109,"Intelligence test":"Raven's Advanced Progressive Matrices; Differential Aptitudes Test (The Psychological Corporation, 1995); Mental Rotation Test","Grade level":10,"Gender":69.3,"rxyi":0.23,"rxxi":0.79,"ux":1.19}
{"Author (year)":"Keehn and Prothro (1955)","Description of the sample":"Section secondaire sample","Country":"Lebanon","n":54,"Intelligence test":"Cattell's Culture-Free Test; Raven's Progressive Matrices; Dominoe's Test D 48 (French version); number series test","Type of intelligence test":"Nonverbal","Grade level":10,"rxyi":0.35,"rxxi":0.7}
{"Author (year)":"Keehn and Prothro (1955)","Description of the sample":"Preparatory section 2 sample","Country":"Lebanon","n":48,"Intelligence test":"Cattell's Culture-Free Test; Raven's Progressive Matrices; Dominoe's Test D 48 (French version); number series test","Type of intelligence test":"Nonverbal","Grade level":10,"rxyi":0.19,"rxxi":0.85}
{"Author (year)":"Keehn and Prothro (1955)","Description of the sample":"Preparatory section 3 sample","Country":"Lebanon","n":48,"Intelligence test":"Cattell's Culture-Free Test; Raven's Progressive Matrices; Dominoe's Test D 48 (French version); number series test","Type of intelligence test":"Nonverbal","Grade level":11,"rxyi":0.16,"rxxi":0.85}
{"Author (year)":"Keehn and Prothro (1955)","Description of the sample":"Preparatory section 4 sample","Country":"Lebanon","n":56,"Intelligence test":"Cattell's Culture-Free Test; Raven's Progressive Matrices; Dominoe's Test D 48 (French version); number series test","Type of intelligence test":"Nonverbal","Grade level":12,"rxyi":0.35,"rxxi":0.85}
{"Author (year)":"Kessels and Steinmayr (2013)","Description of the sample":"Macho sample","Country":"Germany","n":180,"Intelligence test":"Intelligence-Structure-Test 2000R","Type of intelligence test":"Mixed","Grade level":11,"Gender":45.6,"Age":16.4,"rxyi":0.3,"rxxi":0.89,"ux":0.8}
{"Author (year)":"Kleitman and Moscrop (2010)","Description of the sample":"Kleitman and Moscrop's sample","Country":"Australia","n":184,"Intelligence test":"Raven's Progressive Matrices","Type of intelligence test":"Nonverbal","Grade level":5,"Age":10.4,"rxyi":0.35,"rxxi":0.88,"ux":0.88}
{"Author (year)":"Krumm, Lipnevich, Schmidt-Atzert, and Buehner (2012)","Description of the sample":"Krumm et al.'s sample","Country":"Germany","n":161,"Intelligence test":"Intelligence-Structure-Test 2000R","Type of intelligence test":"Mixed","Gender":67,"Age":21,"rxyi":0.27,"rxxi":0.76}
{"Author (year)":"Kundu (1962)","Description of the sample":"Calcutta sample","Country":"India","n":58,"Intelligence test":"Self-developed test including items from M- and L-form from the Terman-Merrill Intelligence Scale (1955)","Grade level":8,"Gender":0,"rxyi":0.31}
{"Author (year)":"Kundu (1975)","Description of the sample":"Female Science stream sample","Country":"India","n":50,"Intelligence test":"Self-developed test including items from M- and L-form from the Terman-Merrill Intelligence Scale (1955)","Grade level":10,"Gender":100,"rxyi":0.68,"ux":0.65}
{"Author (year)":"Kundu (1975)","Description of the sample":"Male Science stream sample","Country":"India","n":50,"Intelligence test":"Self-developed test including items from M- and L-form from the Terman-Merrill Intelligence Scale (1955)","Grade level":10,"Gender":0,"rxyi":0.63,"ux":0.75}
{"Author (year)":"Kundu (1975)","Description of the sample":"Female Humanities stream sample","Country":"India","n":50,"Intelligence test":"Self-developed test including items from M- and L-form from the Terman-Merrill Intelligence Scale (1955)","Grade level":10,"Gender":100,"rxyi":0.31,"ux":0.62}
{"Author (year)":"Kundu (1975)","Description of the sample":"Male Humanities stream sample","Country":"India","n":50,"Intelligence test":"Self-developed test including items from M- and L-form from the Terman-Merrill Intelligence Scale (1955)","Grade level":10,"Gender":0,"rxyi":0.57,"ux":0.69}
{"Author (year)":"Kuusinen and Leskinen (1988)","Description of the sample":"Kuusinen and Leskinen's sample","Country":"Finland","n":234,"Intelligence test":"Illinois Test of Psycholiguistic Abilities","Type of intelligence test":"Verbal","Grade level":9,"Gender":50,"Age":15,"rxyi":0.3,"rxxi":0.95}
{"Author (year)":"Kwall and Lackner (1966)","Description of the sample":"Kwall and Lackner's sample","Country":"USA","n":100,"Intelligence test":"Otis Quick-Scoring Mental Abilities Test","Grade level":4,"Gender":50,"rxyi":0.77,"rxxi":0.88}
{"Author (year)":"Lemos et al. (2014)","Description of the sample":"Old sample","Country":"Portugal","n":1101,"Intelligence test":"Reasoning Tests Battery -- Elementry School","Grade level":11,"Age":16.8,"rxyi":0.32,"rxxi":0.74,"ux":1}
{"Author (year)":"Lemos et al. (2014)","Description of the sample":"Young sample","Country":"Portugal","n":1695,"Intelligence test":"Reasoning Tests Battery -- Secondary School","Grade level":8,"Age":13.5,"rxyi":0.37,"rxxi":0.74,"ux":1}
{"Author (year)":"Levpuscek, Zupancic, and Socan (2013)","Description of the sample":"Slovenia sample","Country":"Slovenia","n":400,"Intelligence test":"Raven's Standard Progressive Matrices","Type of intelligence test":"Nonverbal","Subject domain":"Mathematics and Science","Grade level":9,"Gender":51.9,"Age":13.5,"rxyi":0.51,"rxxi":0.93,"ux":0.86}
{"Author (year)":"Lindgren and De Almeida Guedes (1963)","Description of the sample":"Elementary school sample","Country":"Brazil","n":88,"Intelligence test":"Two 60-item multiple-choice, paper-pencile intelligence tests","Type of intelligence test":"Verbal","Grade level":4,"Age":10.7,"rxyi":0.61,"rxxi":0.66}
{"Author (year)":"Lindgren and De Almeida Guedes (1963)","Description of the sample":"Secondary school sample","Country":"Brazil","n":55,"Intelligence test":"Two 60-item multiple-choice, paper-pencile intelligence tests","Type of intelligence test":"Verbal","Grade level":7,"Age":14.9,"rxyi":0.61,"rxxi":0.64}
{"Author (year)":"Line and Glen (1935)","Description of the sample":"Second grade sample","Country":"Canada","n":61,"Intelligence test":"National Intelligence Test","rxyi":0.57}
{"Author (year)":"Line and Glen (1935)","Description of the sample":"Junior third grade sample","Country":"Canada","n":129,"Intelligence test":"National Intelligence Test","rxyi":0.46}
{"Author (year)":"Line and Glen (1935)","Description of the sample":"Senior third grade sample","Country":"Canada","n":119,"Intelligence test":"National Intelligence Test","rxyi":0.39}
{"Author (year)":"Line and Glen (1935)","Description of the sample":"Junior forth grade sample","Country":"Canada","n":91,"Intelligence test":"National Intelligence Test","rxyi":0.15}
{"Author (year)":"Line and Glen (1935)","Description of the sample":"Senior forth grade sample","Country":"Canada","n":124,"Intelligence test":"National Intelligence Test","rxyi":0.47}
{"Author (year)":"Lu, Weber, Spinath, and Shi (2011)","Description of the sample":"German-Chinese sample","Country":"China","n":179,"Intelligence test":"Culture Fair Intelligence Test","Type of intelligence test":"Nonverbal","Grade level":4,"rxyi":0.45,"rxxi":0.78,"ux":0.96}
{"Author (year)":"Lubbers, Van Der Werf, Kuyper, and Hendriks (2010)","Description of the sample":"Dutch sample","Country":"Netherlands","n":9776,"Intelligence test":"Entry Test","Grade level":7,"Gender":52,"Age":13,"rxyi":0.25,"rxxi":0.79}
{"Author (year)":"Marcus (2000)","Description of the sample":"Marcus's sample","n":210,"Intelligence test":"Wonderlic Personnel Test (German version)","Type of intelligence test":"Verbal","Grade level":13,"Gender":41.8,"Age":23.9,"rxyi":0.36,"rxxi":0.9}
{"Author (year)":"Marcus, Wagner, Poole, Powell, and Carswell (2009)","Description of the sample":"Butchers sample","n":50,"Intelligence test":"Wonderlic Personnel Test (German version)","Type of intelligence test":"Verbal","rxyi":0.39,"rxxi":0.9,"ux":0.56}
{"Author (year)":"Marcus et al. (2009)","Description of the sample":"Butchery shop assistant sample","n":115,"Intelligence test":"Wonderlic Personnel Test (German version)","Type of intelligence test":"Verbal","rxyi":0.45,"rxxi":0.9,"ux":0.58}
{"Author (year)":"Marcus et al. (2009)","Description of the sample":"Bakery shop assistant sample","n":99,"Intelligence test":"Wonderlic Personnel Test (German version)","Type of intelligence test":"Verbal","rxyi":0.21,"rxxi":0.9,"ux":0.54}
{"Author (year)":"Matlin and Mendelsohn (1965)","Description of the sample":"Matlin and Mendelsohn's sample","Country":"USA","n":68,"Intelligence test":"Otis Quick-Scoring Mental Abilities Test","Type of intelligence test":"Mixed","Grade level":5,"rxyi":0.6,"rxxi":0.86}
{"Author (year)":"Matthews, Marulis, and Williford (2014)","Description of the sample":"NICHD SECCYD sample","Country":"USA","n":923,"Intelligence test":"Woodcock-Johnson Picture Vocabulary","Type of intelligence test":"Verbal","Grade level":5,"Age":4.5,"rxyi":0.42,"rxxi":0.76}
{"Author (year)":"Mayer (1958)","Description of the sample":"Delaware sample","Country":"US","n":100,"Intelligence test":"Wechsler Intelligence Scale for Children","Type of intelligence test":"Mixed","Grade level":7,"rxyi":0.73,"rxxi":0.89}
{"Author (year)":"Meili, Aebi, Heizmann, and Schoefer (1977)","Description of the sample":"Lucerne 1970 sample","Country":"Switzerland","n":185,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.34}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Lucerne 1971 sample","Country":"Switzerland","n":153,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.32}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Zurich 1971 sample","Country":"Switzerland","n":128,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.38}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Winterthur 1971 sample","Country":"Switzerland","n":104,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.39}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Winterthur 1972 sample","Country":"Switzerland","n":87,"Intelligence test":"Self-developed test battery","rxyi":0.51}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Basel 1971 sample I","Country":"Switzerland","n":175,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.39}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Basel 1971 sample II","Country":"Switzerland","n":209,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.44}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Basel 1972 sample I","Country":"Switzerland","n":139,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.45}
{"Author (year)":"Meili et al. (1977)","Description of the sample":"Basel 1972 sample II","Country":"Switzerland","n":281,"Intelligence test":"Self-developed test battery","Gender":100,"rxyi":0.38}
{"Author (year)":"Millikin (1976)","Description of the sample":"South Texas sample","Country":"USA","n":306,"Intelligence test":"Differential Aptitude Test","Type of intelligence test":"Mixed","Grade level":11,"Gender":54.6,"rxyi":0.68}
{"Author (year)":"Moenikia and Zahed-Babelan (2010)","Description of the sample":"Iran sample","Country":"Iran","n":1670,"Intelligence test":"Raven's Intelligence Test","Type of intelligence test":"Nonverbal","Subject domain":"Mathematics and Science","Gender":44.2,"rxyi":0.45,"rxxi":0.86}
{"Author (year)":"Moore (1939)","Description of the sample":"Moore's sample","Country":"USA","n":174,"Intelligence test":"Otis Group Intelligence Scale","Type of intelligence test":"Mixed","Grade level":6,"rxyi":0.69}
{"Author (year)":"Mottus, Guljajev, Allik, Laidra, and Pullmann (2012)","Description of the sample":"Mottus et al.'s sample","Country":"Estonia","n":1159,"Intelligence test":"Raven's Standard Progessive Matrices","Type of intelligence test":"Nonverbal","Gender":0,"Age":14.6,"rxyi":0.43,"rxxi":0.8}
{"Author (year)":"Myburgh, Grobler, and Niehaus (1999)","Description of the sample":"Roodepoort sample","Country":"South Africa","n":656,"rxyi":0.56}
{"Author (year)":"Neuenschwander (2013)","Description of the sample":"PSB sample","Country":"Switzerland","n":187,"Intelligence test":"Prufsystem fur Schul- und Bildungsberatung 6-13","Grade level":6,"Gender":49.7,"rxyi":0.63,"rxxi":0.9,"ux":1.12}
{"Author (year)":"Neuenschwander, R_thlisberger, Cimeli, and Roebers (2012)","Description of the sample":"Mixed-class-sample","Country":"Switzerland","n":459,"Intelligence test":"Test of Nonverbal Intelligence -- Third Edition","Type of intelligence test":"Nonverbal","Grade level":1,"Gender":49,"Age":7.4,"rxyi":0.35}
{"Author (year)":"Oates (1929)","Description of the sample":"Form IIa sample","Country":"Great Britain","n":35,"Intelligence test":"Self-developed test battery","Grade level":2,"Gender":0,"rxyi":0.34}
{"Author (year)":"Oates (1929)","Description of the sample":"Form IIb sample","Country":"Great Britain","n":35,"Intelligence test":"Self-developed test battery","Grade level":2,"Gender":0,"rxyi":0.32}
{"Author (year)":"Oates (1929)","Description of the sample":"Form IIIa sample","Country":"Great Britain","n":34,"Intelligence test":"Self-developed test battery","Grade level":3,"Gender":0,"rxyi":0.63}
{"Author (year)":"Oates (1929)","Description of the sample":"Form IIIb sample","Country":"Great Britain","n":33,"Intelligence test":"Self-developed test battery","Grade level":3,"Gender":0,"rxyi":0.21}
{"Author (year)":"Oates (1929)","Description of the sample":"Form IVa sample","Country":"Great Britain","n":34,"Intelligence test":"Self-developed test battery","Grade level":4,"Gender":0,"rxyi":0.34}
{"Author (year)":"Oates (1929)","Description of the sample":"Form IVb sample","Country":"Great Britain","n":33,"Intelligence test":"Self-developed test battery","Grade level":4,"Gender":0,"rxyi":0.15}
{"Author (year)":"Oates (1929)","Description of the sample":"Form R sample","Country":"Great Britain","n":16,"Intelligence test":"Self-developed test battery","Gender":0,"rxyi":-0.13}
{"Author (year)":"Oates (1929)","Description of the sample":"Form Va sample","Country":"Great Britain","n":28,"Intelligence test":"Self-developed test battery","Grade level":5,"Gender":0,"rxyi":0.26}
{"Author (year)":"Oates (1929)","Description of the sample":"Form Vb sample","Country":"Great Britain","n":29,"Intelligence test":"Self-developed test battery","Grade level":5,"Gender":0,"rxyi":0.62}
{"Author (year)":"Peterson, Pihl, Higgins, Seguin, and Tremblay (2003)","Description of the sample":"Peterson et al.'s sample","Country":"Canada","n":148,"Intelligence test":"Wechsler Intelligence Scale for Children -- Revised","Type of intelligence test":"Mixed","Gender":0,"Age":14,"rxyi":0.46,"rxxi":0.91}
{"Author (year)":"Petrides, Chamorro-Premuzic, Frederickson, and Furnham (2005)","Description of the sample":"Female sample","Country":"Great Britain","n":297,"Intelligence test":"Verbal Reasoning Test (Department of Assessment and Measurement at the National Foundation for Educational Research)","Type of intelligence test":"Verbal","Grade level":11,"Gender":100,"rxyi":0.85,"rxxi":0.97,"ux":1.01}
{"Author (year)":"Petrides et al. (2005)","Description of the sample":"Male sample","Country":"Great Britain","n":321,"Intelligence test":"Verbal Reasoning Test (Department of Assessment and Measurement at the National Foundation for Educational Research)","Type of intelligence test":"Verbal","Grade level":11,"Gender":0,"rxyi":0.84,"rxxi":0.97,"ux":1}
{"Author (year)":"Phillipson and Phillipson (2012)","Description of the sample":"Hong-Kong sample","Country":"China","n":780,"Intelligence test":"Raven's Progressive Matrices","Type of intelligence test":"Nonverbal","Gender":52.5,"rxyi":0.28,"rxxi":0.8}
{"Author (year)":"Powell and Nettelbeck (2014)","Description of the sample":"Curiosity sample","Country":"Australia","n":160,"Intelligence test":"Raven's Advanced Progressive Matrices-Short Form","Type of intelligence test":"Nonverbal","Grade level":12,"Gender":68.8,"Age":19.4,"rxyi":0.49,"rxxi":0.75,"ux":0.61}
{"Author (year)":"Preckel and Brull (2010)","Description of the sample":"Trier sample","Country":"Germany","n":678,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Subject domain":"Mathematics and Science","Grade level":5,"Gender":52.1,"Age":10.4,"rxyi":0.43,"rxxi":0.92}
{"Author (year)":"Preckel, G_tz, and Frenzel (2010)","Description of the sample":"Boredom sample","Country":"Germany","n":144,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Grade level":9,"Gender":43,"Age":14.8,"rxyi":0.62,"rxxi":0.93,"ux":0.9}
{"Author (year)":"Preckel et al. (2013)","Description of the sample":"Morning sample","Country":"Germany","n":237,"Intelligence test":"Culture Fair Intelligence Test-20 (German adaptation)","Type of intelligence test":"Nonverbal","Grade level":10,"Gender":46.7,"Age":15.6,"rxyi":0.44,"rxxi":0.93,"ux":1.41}
{"Author (year)":"Qualter, Gardner, Pope, Hutchinson, and Whiteley (2012)","Description of the sample":"Female sample","Country":"Great Britain","n":214,"Intelligence test":"Cognitive Ability Test","Grade level":11,"Gender":100,"Age":11.2,"rxyi":0.43}
{"Author (year)":"Qualter et al. (2012)","Description of the sample":"Male sample","Country":"Great Britain","n":199,"Intelligence test":"Cognitive Ability Test","Grade level":11,"Gender":0,"Age":11.2,"rxyi":0.64}
{"Author (year)":"Rauh (1977)","Description of the sample":"Rauh's sample","n":42,"Intelligence test":"Wechsler Preschool and Primary Scale of Intelligence; Hamburg-Wechsler-Intelligence tests for Children-1; Hamburg-Wechsler-Intelligence tests for Chrildren-2; Picture Test for 2. and 3. grade; Aufgaben zum Nachdenken 4 +; Prufsystem fur Schul- und Bildungsberatung","rxyi":0.72,"rxxi":0.95,"ux":0.91}
{"Author (year)":"Rindermann and Neubauer (2000)","Description of the sample":"Rindermann and Neubauer's sample","Country":"Germany","n":157,"Intelligence test":"German Cognitive Ability Test; Advanced Progressive Matrices","Grade level":10,"rxyi":0.44,"rxxi":0.83}
{"Author (year)":"Rindermann and Neubauer (2004)","Description of the sample":"Rindermann and Neubauer's sample","Country":"Germany","n":271,"Intelligence test":"Raven's Advanced Progressive Matrices; German Cognitive Ability Test","Grade level":10,"Age":15.5,"rxyi":0.52,"rxxi":0.83}
{"Author (year)":"Rogers (1933)","Description of the sample":"Public school sample","Country":"Canada","n":80,"Intelligence test":"Pintner Group Test","Type of intelligence test":"Verbal","Grade level":4,"rxyi":0.62,"rxxi":0.97}
{"Author (year)":"Rosander and Backstrom (2012)","Description of the sample":"Female sample","Country":"Sweden","n":245,"Intelligence test":"Wonderlic Personnel Test","Type of intelligence test":"Mixed","Gender":100,"Age":17.2,"rxyi":0.49,"rxxi":0.9,"ux":0.79}
{"Author (year)":"Rosander and Backstrom (2012)","Description of the sample":"Male sample","Country":"Sweden","n":197,"Intelligence test":"Wonderlic Personnel Test","Type of intelligence test":"Mixed","Gender":0,"Age":17.2,"rxyi":0.49,"rxxi":0.9,"ux":0.79}
{"Author (year)":"Rosander et al. (2011)","Description of the sample":"Lund sample","Country":"Sweden","n":297,"Intelligence test":"Wonderlic Personnel Test","Type of intelligence test":"Mixed","Gender":53,"Age":17.6,"rxyi":0.38,"rxxi":0.9,"ux":0.9}
{"Author (year)":"Sauer and Gamsjaeger (1996)","Description of the sample":"Sauer and Gamsjaeger's sample","Country":"Austria","n":651,"Intelligence test":"Pruefsystem fuer die Schul- und Bildungsberatung","Type of intelligence test":"Mixed","Grade level":4,"Gender":47.8,"rxyi":0.56,"rxxi":0.98}
{"Author (year)":"Sauer and Gamsjaeger (1996)","Description of the sample":"Salzburg sample","Country":"Austria","n":599,"Intelligence test":"Pruefsystem fuer die Schul- und Bildungsberatung","Type of intelligence test":"Mixed","Grade level":4,"Gender":50,"rxyi":0.66,"rxxi":0.98}
{"Author (year)":"Scarr, Caparlo, Ferndman, Tower, and Caplan (1983)","Description of the sample":"British Midlands sample","Country":"Great Britain","n":639,"Intelligence test":"Young Nonreaders' IQ Test; Nonverbal (National Foundation for Educational Research) f","Type of intelligence test":"Nonverbal","Grade level":12,"rxyi":0.73}
{"Author (year)":"Schaefer and McDermott (1999)","Description of the sample":"Supplementary national sample","Country":"USA","n":420,"Intelligence test":"Differential Ability Scales","Gender":50,"rxyi":0.4,"rxxi":0.82}
{"Author (year)":"Schneider, Grabner, and Paetsch (2009)","Description of the sample":"MPI Sample","Country":"Germany","n":195,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Type of intelligence test":"Mixed","Subject domain":"Mathematics and Science","Grade level":6,"Gender":51.2,"Age":11.3,"rxyi":0.6,"rxxi":0.95}
{"Author (year)":"Schult (2013)","Description of the sample":"Female sample I","Country":"Germany","n":41,"Intelligence test":"Berlin Structure of Intelligence","Gender":100,"rxyi":0.36,"rxxi":0.82}
{"Author (year)":"Schult (2013)","Description of the sample":"Female sample II","Country":"Germany","n":435,"Intelligence test":"Berlin Structure of Intelligence","Gender":100,"rxyi":0.33,"rxxi":0.82}
{"Author (year)":"Schult (2013)","Description of the sample":"Female sample III","Country":"Germany","n":1033,"Intelligence test":"Berlin Structure of Intelligence","Gender":100,"rxyi":0.51,"rxxi":0.73}
{"Author (year)":"Schult (2013)","Description of the sample":"Male sample I","Country":"Germany","n":46,"Intelligence test":"Berlin Structure of Intelligence","Gender":0,"rxyi":0.63,"rxxi":0.82}
{"Author (year)":"Schult (2013)","Description of the sample":"Male sample II","Country":"Germany","n":293,"Intelligence test":"Berlin Structure of Intelligence","Gender":0,"rxyi":0.35,"rxxi":0.82}
{"Author (year)":"Schult (2013)","Description of the sample":"Male sample III","Country":"Germany","n":768,"Intelligence test":"Berlin Structure of Intelligence","Gender":0,"rxyi":0.43,"rxxi":0.73}
{"Author (year)":"Schwinger, Steinmayr, and Spinath (2009)","Description of the sample":"Giessen Sample","Country":"Germany","n":231,"Intelligence test":"Culture Fair Test-3","Type of intelligence test":"Nonverbal","Grade level":12,"Gender":60.2,"Age":16.8,"rxyi":0.23,"rxxi":0.78,"ux":0.62}
{"Author (year)":"Seitz (1971)","Description of the sample":"Wuerzburg sample","Country":"Germany","n":99,"Intelligence test":"Analytischer Intelligenztest; Culture Fair Intelligence Test; Frankfurter Schultestg","Grade level":6,"Gender":52.5,"Age":12.3,"rxyi":0.18,"rxxi":0.78}
{"Author (year)":"Sharma, Sharma, and Sharma (2011)","Description of the sample":"Female sample","Country":"India","n":100,"Intelligence test":"General Mental Ability Test; Standard Progressive Matrices","Grade level":11,"Gender":100,"rxyi":0.45,"rxxi":0.91}
{"Author (year)":"Sharma et al. (2011)","Description of the sample":"Male sample","Country":"India","n":100,"Intelligence test":"General Mental Ability Test; Standard Progressive Matrices","Grade level":11,"Gender":0,"rxyi":0.52,"rxxi":0.91}
{"Author (year)":"Singh and Varma (1995)","Description of the sample":"Rural sample","Country":"India","n":200,"Intelligence test":"Raven's Standard Progressive Matrices (1960)","Type of intelligence test":"Nonverbal","Grade level":11,"Gender":50,"rxyi":0.02,"rxxi":0.93}
{"Author (year)":"Singh and Varma (1995)","Description of the sample":"Urban sample","Country":"India","n":200,"Intelligence test":"Raven's Standard Progressive Matrices (1960)","Type of intelligence test":"Nonverbal","Grade level":11,"Gender":50,"rxyi":0.02,"rxxi":0.93}
{"Author (year)":"Sonnleitner, Keller, Martin, and Brunner (2013)","Description of the sample":"Problem solving sample","Country":"Luxembourg","n":563,"Intelligence test":"Intelligence-Structure-Test 2000R","Type of intelligence test":"Mixed","Grade level":10,"Gender":48.7,"Age":17.4,"rxyi":0.51,"rxxi":0.73}
{"Author (year)":"Spinath, Harald Freudenthaler, and Neubauer (2010)","Description of the sample":"Female sample","Country":"Austria","n":801,"Intelligence test":"Intelligenz Struktur Analyse","Grade level":8,"Gender":100,"Age":13.7,"rxyi":0.41,"rxxi":0.9}
{"Author (year)":"Spinath et al. (2010)","Description of the sample":"Male sample","Country":"Austria","n":522,"Intelligence test":"Intelligenz Struktur Analyse","Grade level":8,"Gender":0,"Age":13.7,"rxyi":0.47,"rxxi":0.9}
{"Author (year)":"Spinath, Spinath, and Plomin (2008)","Description of the sample":"Twin sample","Country":"Great Britain","n":4492,"Intelligence test":"Wechsler Intelligence Scale for Children-III; Cognitive Ability Test -- Third Version","Grade level":4,"rxyi":0.43}
{"Author (year)":"St. John (1930)","Description of the sample":"Female sample","Country":"USA","n":455,"Intelligence test":"Standford-Binet-Test; Dearborn General; Otis Primary; Myers Mental Measure","Gender":100,"rxyi":0.55}
{"Author (year)":"St. John (1930)","Description of the sample":"Male sample","Country":"USA","n":503,"Intelligence test":"Standford-Binet-Test; Dearborn General; Otis Primary; Myers Mental Measure","Gender":0,"rxyi":0.44}
{"Author (year)":"Steinmayr, Dinger, and Spinath (2010)","Description of the sample":"Personality sample","Country":"Germany","n":548,"Intelligence test":"Intelligence-Structure-Test-2000-R","Grade level":12,"Gender":61.2,"Age":17,"rxyi":0.27,"rxxi":0.9,"ux":0.84}
{"Author (year)":"Steinmayr and Meissner (2013)","Description of the sample":"Realschule sample","Country":"Germany","n":187,"Intelligence test":"Culture Fair Test-20-Revision","Type of intelligence test":"Nonverbal","Subject domain":"Mathematics and Science","Grade level":8,"Gender":48.8,"Age":13.6,"rxyi":0.26,"rxxi":0.86,"ux":0.62}
{"Author (year)":"Steinmayr and Meissner (2013)","Description of the sample":"Gymnasium sample","Country":"Germany","n":276,"Intelligence test":"Culture Fair Test-20-Revision","Type of intelligence test":"Nonverbal","Subject domain":"Mathematics and Science","Grade level":8,"Gender":48.8,"Age":13.6,"rxyi":0.39,"rxxi":0.86,"ux":0.62}
{"Author (year)":"Steinmayr and Spinath (2009)","Description of the sample":"Steinmayr and Spinath's sample","Country":"Germany","n":328,"Intelligence test":"Intelligence-Structure-Test","Grade level":12,"Gender":59.7,"Age":16.9,"rxyi":0.35,"rxxi":0.9}
{"Author (year)":"Steinmayr, Wirthwein, and Schoene (2014)","Description of the sample":"Math sample","Country":"Germany","n":301,"Intelligence test":"Intelligence-Structure-Test-2000-R","Type of intelligence test":"Mixed","Subject domain":"Mathematics and Science","Grade level":12,"Gender":49.2,"Age":17.5,"rxyi":0.41,"rxxi":0.92,"ux":0.53}
{"Author (year)":"Stejskal (1935)","Description of the sample":"Prague sample","Country":"Czech Republic","n":3214,"rxyi":0.66}
{"Author (year)":"Suess (2001)","Description of the sample":"Suess's sample","Country":"Germany","n":137,"Intelligence test":"Berlin Structure of Intelligence-Test","Type of intelligence test":"Mixed","Grade level":12,"rxyi":0.16,"rxxi":0.82}
{"Author (year)":"Svensson (1971)","Description of the sample":"Elementary school sample","Country":"Sweden","n":1500,"Age":13,"rxyi":0.66,"rxxi":0.9}
{"Author (year)":"Svensson (1971)","Description of the sample":"Comprehensive school sample","Country":"Sweden","n":6144,"Age":13,"rxyi":0.69,"rxxi":0.9}
{"Author (year)":"Svensson (1971)","Description of the sample":"Elementary school sample","Country":"Sweden","n":8905,"Age":13,"rxyi":0.67,"rxxi":0.86}
{"Author (year)":"Nijenhuis, Resing, Tolboom, and Bleichrodt (2004)","Description of the sample":"7.8 year old Dutch sample","Country":"Netherlands","n":196,"Intelligence test":"Amsterdam Intelligence Test for Children -- Revised","Age":7.8,"rxyi":0.54}
{"Author (year)":"Nijenhuis et al. (2004)","Description of the sample":"9.8 year old Dutch sample","Country":"Netherlands","n":204,"Intelligence test":"Amsterdam Intelligence Test for Children -- Revised","Age":9.8,"rxyi":0.43}
{"Author (year)":"Nijenhuis et al. (2004)","Description of the sample":"7.8 year old immigrants sample","Country":"Netherlands","n":192,"Intelligence test":"Amsterdam Intelligence Test for Children -- Revised","Age":7.8,"rxyi":0.5}
{"Author (year)":"Nijenhuis et al. (2004)","Description of the sample":"9.8 year old immigrants sample","Country":"Netherlands","n":184,"Intelligence test":"Amsterdam Intelligence Test for Children -- Revised","Age":9.8,"rxyi":0.4}
{"Author (year)":"Telles Da Silva, Borges Osorio, and Salzano (1975)","Description of the sample":"Monozygotic twins sample","Country":"Brazil","n":79,"Intelligence test":"Dominoes Test (Anstey, 1967); Differential Aptitude Test","Gender":65,"Age":20,"rxyi":0.27,"rxxi":0.7}
{"Author (year)":"Telles Da Silva et al. (1975)","Description of the sample":"Dizygotic twins sample","Country":"Brazi","n":75,"Intelligence test":"Dominoes Test (Anstey, 1967); Differential Aptitude Test","Gender":77.3,"Age":19,"rxyi":0.25,"rxxi":0.7}
{"Author (year)":"Tiedemann and Faber (1992)","Description of the sample":"Tiedemann and Faber's sample","Country":"Germany","n":96,"Intelligence test":"Columbia Mental Maturity Scale (German version)","Type of intelligence test":"Nonverbal","Gender":77.3,"Age":7.3,"rxyi":0.19,"rxxi":0.88}
{"Author (year)":"Todt (1966)","Description of the sample":"Language stream sample","Country":"Germany","n":95,"Intelligence test":"Wilde Intelligence Test","Type of intelligence test":"Mixed","Grade level":12,"Gender":0,"rxyi":0.33,"rxxi":0.81}
{"Author (year)":"Todt (1966)","Description of the sample":"Science stream sample","Country":"Germany","n":113,"Intelligence test":"Wilde Intelligence Test","Type of intelligence test":"Mixed","Grade level":12,"Gender":0,"rxyi":0.43,"rxxi":0.81}
{"Author (year)":"Trautwein, Luedtke, Roberts, Schnyder, and Niggli (2009)","Description of the sample":"Trautwein et al.'s sample I","Country":"Germany","n":571,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Type of intelligence test":"Nonverbal","Grade level":8,"Gender":51.4,"Age":14.7,"rxyi":0.16,"rxxi":0.87}
{"Author (year)":"Trautwein et al. (2009)","Description of the sample":"Trautwein et al.'s sample II","Country":"Germany","n":415,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Type of intelligence test":"Nonverbal","Subject domain":"Mathematics and Science","Grade level":8,"Gender":58.5,"Age":13.5,"rxyi":0.29,"rxxi":0.9}
{"Author (year)":"Trautwein et al. (2009)","Description of the sample":"Trautwein et al.'s sample III","Country":"Switzerland","n":1535,"Intelligence test":"German Cognitive Ability Test 4-13","Type of intelligence test":"Verbal","Subject domain":"Languages","Grade level":7,"Gender":53,"Age":23.8,"rxyi":0.22,"rxxi":0.89}
{"Author (year)":"Trost and Bickel (1979)","Description of the sample":"Female sample","n":113,"Intelligence test":"Test der akademischen Bef_higung","Type of intelligence test":"Verbal","Grade level":13,"Gender":100,"rxyi":0.31,"rxxi":0.89}
{"Author (year)":"Trost and Bickel (1979)","Description of the sample":"Male sample","n":526,"Intelligence test":"Test der akademischen Bef_higung","Type of intelligence test":"Verbal","Grade level":13,"Gender":0,"rxyi":0.26,"rxxi":0.89}
{"Author (year)":"Turney (1930)","Description of the sample":"Freshmen sample","Country":"USA","n":68,"Intelligence test":"Army Group Examination Alpha; Pressey Senior Classification Test; Haggerty Intelligence Examination; Terman Group Test of Mental Ability; Miller Mental Ability Test","Grade level":9,"rxyi":0.65,"rxxi":0.92}
{"Author (year)":"Turney (1930)","Description of the sample":"Sophomore sample","Country":"USA","n":70,"Intelligence test":"Army Group Examination Alpha; Haggerty Intelligence Examination; Terman Group Test of Mental Ability; Miller Mental Ability Test","Grade level":10,"rxyi":0.56,"rxxi":0.93}
{"Author (year)":"Turney (1930)","Description of the sample":"Juniors sample","Country":"USA","n":65,"Intelligence test":"Army Group Examination Alpha; Pressey Senior Classification Test; Haggerty Intelligence Examination; Terman Group Test of Mental Ability; Miller Mental Ability","Grade level":11,"rxyi":0.61,"rxxi":0.92}
{"Author (year)":"Turney (1930)","Description of the sample":"Seniors sample","Country":"USA","n":65,"Intelligence test":"Terman Group Test of Mental Ability; Otis Self-Administering Tests of Mental Ability, Higher Examination; Army Group Examination Alpha; Stanford-Binet Individual Examination","Grade level":12,"rxyi":0.69,"rxxi":0.94}
{"Author (year)":"Valenzuela (1971)","Description of the sample":"Spanish-American sample","Country":"USA","n":20,"Grade level":11,"Age":17,"rxyi":0.19}
{"Author (year)":"Valenzuela (1971)","Description of the sample":"Anglo-American sample","Country":"USA","n":20,"Grade level":11,"Age":17,"rxyi":0.48}
{"Author (year)":"Vecchione, Alessandri, and Marsicano (2014)","Description of the sample":"Female sample","Country":"Italy","n":54,"Intelligence test":"Culture Fair Test","Type of intelligence test":"Nonverbal","Grade level":12,"Gender":100,"rxyi":0.09,"rxxi":0.78}
{"Author (year)":"Vecchione et al. (2014)","Description of the sample":"Male sample","Country":"Italy","n":47,"Intelligence test":"Culture Fair Test","Type of intelligence test":"Nonverbal","Grade level":12,"Gender":0,"rxyi":0.26,"rxxi":0.78}
{"Author (year)":"Vock, Preckel, and Holling (2011)","Description of the sample":"BIS sample","Country":"Germany","n":1135,"Intelligence test":"Berlin Structure of Intelligence Test for Youth: Assessment of Talent and Giftedness","Type of intelligence test":"Mixed","Gender":46.2,"Age":14.5,"rxyi":0.4,"rxxi":0.88,"ux":1.03}
{"Author (year)":"Vrdoljak and Velki (2012)","Description of the sample":"Croatia sample","Country":"Croatia","n":161,"Intelligence test":"Cognitive-nonverbal test","Type of intelligence test":"Nonverbal","Grade level":8,"Gender":47.7,"Age":13.1,"rxyi":0.45,"rxxi":0.93}
{"Author (year)":"Watkins and Astilla (1980)","Description of the sample":"Watkins and Astilla's sample","Country":"Central Philippines","n":187,"Intelligence test":"Otis-Lennon Mental Abilities Test","Type of intelligence test":"Mixed","Gender":100,"rxyi":0.63,"rxxi":0.86,"ux":0.65}
{"Author (year)":"Watterson, Schuerger, and Melnyk (1976)","Description of the sample":"Watterson et al.'s sample","Country":"USA","n":163,"Intelligence test":"Culture Fair Intelligence Test","Type of intelligence test":"Nonverbal","Gender":0,"rxyi":0.31}
{"Author (year)":"Weber, Lu, Shi, and Spinath (2013)","Description of the sample":"German-Chinese sample","Country":"Germany","n":320,"Intelligence test":"Culture Fair Test-20-Revised","Type of intelligence test":"Nonverbal","Grade level":4,"Gender":54,"Age":9.7,"rxyi":0.32}
{"Author (year)":"Wellman (1957)","Description of the sample":"Iowa sample","Country":"USA","n":120,"Intelligence test":"Otis Quick Scoring Mental Ability Tests; SRA Primary Mental Abilities Test","Grade level":12,"Gender":50,"rxyi":0.74,"rxxi":0.89}
{"Author (year)":"Wright and Parker (1978)","Description of the sample":"Aboriginal sample","Country":"Australia","n":35,"Intelligence test":"ACER Intermediate Test D (Australian Council for Educational Research, 1958)","Type of intelligence test":"Verbal","Grade level":8,"Gender":51.4,"Age":13.8,"rxyi":0.27,"rxxi":0.93}
{"Author (year)":"Wright and Parker (1978)","Description of the sample":"Non-aboriginal sample","Country":"Australia","n":58,"Intelligence test":"ACER Intermediate Test D (Australian Council for Educational Research, 1958)","Type of intelligence test":"Verbal","Grade level":8,"Gender":44.8,"Age":13.4,"rxyi":0.52,"rxxi":0.93}
{"Author (year)":"Xin and Zhang (2009)","Description of the sample":"Chinese math sample","Country":"China","n":119,"Intelligence test":"Revised Raven's Standard Progressive Matrices","Type of intelligence test":"Nonverbal","Subject domain":"Mathematics and Science","Grade level":5,"Gender":52.1,"Age":11.5,"rxyi":0.45,"rxxi":0.85}
{"Author (year)":"Zaunbauer, Retelsdorf, and M_ller (2009)","Description of the sample":"Realschule Zaunbauer","Country":"Germany","n":292,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Type of intelligence test":"Nonverbal","Subject domain":"Languages","Grade level":5,"Gender":50.3,"Age":10.9,"rxyi":0.14,"rxxi":0.83}
{"Author (year)":"Zaunbauer et al. (2009)","Description of the sample":"Gymnasium Zaunbauer","Country":"Germany","n":418,"Intelligence test":"German Cognitive Ability Test -- 4-12 -- Revision","Type of intelligence test":"Nonverbal","Subject domain":"Languages","Grade level":5,"Gender":51.4,"Age":10.9,"rxyi":0.12,"rxxi":0.83}
{"Author (year)":"Ziegler, Knogler, and Buehner (2009)","Description of the sample":"Psychology sample","Country":"Germany","n":271,"Intelligence test":"Intelligence-Structure-Test-2000-Revised","Type of intelligence test":"Mixed","Gender":82,"Age":20,"rxyi":0.22,"rxxi":0.92,"ux":0.87}
{"Author (year)":"Zuffiano et al. (2013)","Description of the sample":"Rom sample","Country":"Italy","n":170,"Intelligence test":"Culture Fair Test","Type of intelligence test":"Nonverbal","Grade level":7,"Gender":51.2,"Age":13.5,"rxyi":0.3,"rxxi":0.77,"ux":0.71}