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Direct linkAl-Shahomee, Alsedig Abdalgadr; Lynn, Richard; Abdalla, Saleh El-ghmary – Intelligence, 2013
The Standard Progressive Matrices (SPM) was administered to a sample of 592 16 year old school students in Libya. There was a small negative correlation of -0.14 between SPM scores and the number of siblings, indicating only marginal dysgenic fertility. Supplementary material giving the data is given online. (Contains 1 table.)
Descriptors: Intelligence, Foreign Countries, Family Size, Siblings
Kristensen, Petter; Bjerkedal, Tor – Intelligence, 2010
This register-based longitudinal study of 392 969 Norwegians examined associations between birth order, gender and educational attainment at age 25 years within families (fixed effects regression) and between families (ordinary OLS regression). Data were retrieved from national registers for births of mothers with single births only and a first…
Descriptors: Educational Attainment, Birth Order, Foreign Countries, Longitudinal Studies
Boomsma, Dorret I.; van Beijsterveld, T. C. E. M.; Beem, A. L.; Hoekstra, R. A.; Polderman, T. J. C.; Bartels, M. – Intelligence, 2008
The relation between intelligence and birth order was shown in a recent publication [Bjerkedal, T., Kristensen, P., Skjeret, G. A. & Brevik, J. I. (2007). Intelligence test scores and birth order among young Norwegian men (conscripts) analyzed within and between families. "Intelligence," 35, 503-514] to be negative. Subjects in this…
Descriptors: Intelligence, Twins, Females, Family Size
Bjerkedal, Tor; Kristensen, Petter; Skjeret, Geir A.; Brevik, John I. – Intelligence, 2007
The present paper reports the results of a within and between family analysis of the relation between birth order and intelligence. The material comprises more than a quarter of a million test scores for intellectual performance of Norwegian male conscripts recorded during 1984-2004. Conscripts, mostly 18-19 years of age, were born to women for…
Descriptors: Foreign Countries, Males, Siblings, Marital Status
Peer reviewedRetherford, Robert D.; Sewell, William H. – Intelligence, 1989
Using data for 4,316 men and 4,782 women--from the 1975 Wisconsin Longitudinal Study of Social and Psychological Factors in Educational and Occupational Aspirations and Achievement--the relationship between intelligence quotient (IQ) and fertility was assessed. The effect of education on family size predicts the direction of evolution of genotypic…
Descriptors: Family Size, Intelligence Quotient, Longitudinal Studies, Path Analysis
Peer reviewedGalbraith, Richard C. – Intelligence, 1983
Support for the confluence model of intellectual development has come from analyses of family size-birth order means of large aggregate data sets. Analyses of individual scores do not substantiate the confluence model, as explained variance is markedly reduced. The study of family interaction variables utilizing longitudinal data is recommended.…
Descriptors: Birth Order, Environmental Influences, Family Influence, Family Size
