Association between birth weight and educational attainment: an individual-based pooled analysis of nine twin cohorts

Journal of Epidemiology and Community Health
Aline JelenkovicKarri Silventoinen

Abstract

There is evidence that birth weight is positively associated with education, but it remains unclear whether this association is explained by familial environmental factors, genetic factors or the intrauterine environment. We analysed the association between birth weight and educational years within twin pairs, which controls for genetic factors and the environment shared between co-twins. The data were derived from nine twin cohorts in eight countries including 6116 complete twin pairs. The association between birth weight and educational attainment was analysed both between individuals and within pairs using linear regression analyses. In between-individual analyses, birth weight was not associated with educational years. Within-pairs analyses revealed positive but modest associations for some sex, zygosity and birth year groups. The greatest association was found in dizygotic (DZ) men (0.65 educational years/kg birth weight, p=0.006); smaller effects of 0.3 educational years/kg birth weight were found within monozygotic (MZ) twins of both sexes and opposite-sex DZ twins. The magnitude of the associations differed by birth year in MZ women and opposite-sex DZ twins, showing a positive association in the 1915-1959 birth cohort ...Continue Reading

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Citations

Aug 1, 2019·Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies·K SilventoinenJ Kaprio
Feb 16, 2021·The British Journal of Psychiatry : the Journal of Mental Science·Massimiliano OrriMarie-Claude Geoffroy

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