Abstract:
OBJECTIVE:To examine the association between intrauterine growth and intelligence. DESIGN:Population based birth cohort study of sibling pairs born within a maximum of three years of each other. SETTING:Mater-University women and children's hospital, Brisbane, Australia. PARTICIPANTS:235 (470 children) sibling pairs. RESULTS:Among one randomly selected sibling from each pair verbal comprehension at age 5, general intelligence at age 14, and reading ability at age 14 increased linearly with increasing gestational age and sex standardised birth weight z scores. With adjustment for maternal age, race, and smoking during pregnancy, birth order, family income, and parental education the associations with verbal comprehension at age 5 and general intelligence at age 14 remained, whereas the association with reading ability at age 14 was attenuated to the null. Within sibling pairs, differences in intrauterine growth were positively associated with differences in verbal comprehension at age 5 (test score difference per one unit difference in birth weight z score = 1.52 (0.11 to 3.26)) and general intelligence at age 14 (1.09 (0.01 to 2.18)), but not with reading ability at age 14. CONCLUSIONS:Socioeconomic position or other fixed maternal characteristics do not seem to explain the positive association between intrauterine growth and childhood intelligence.
journal_name
J Epidemiol Community Healthjournal_title
Journal of epidemiology and community healthauthors
Lawlor DA,Bor W,O'Callaghan MJ,Williams GM,Najman JMdoi
10.1136/jech.2004.025262keywords:
subject
Has Abstractpub_date
2005-04-01 00:00:00pages
279-82issue
4eissn
0143-005Xissn
1470-2738pii
59/4/279journal_volume
59pub_type
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