Primal Health Databank: Study

Entry No:0731
Title:The influence of birth size on intelligence in healthy children
Author(s):Broekman BF, Chan YH, Quek SC, et al.
Reference:Pediatrics. 2009 Jun;123(6):e1011-6
Place of Study:Singapore
Abstract: A cohort of 1979 of 2913 Asian children aged 7 to 9 years, recruited from 3 schools in Singapore, were followed yearly from 1999 onward. Birth parameters were recorded by health personnel. Childhood IQ was measured with the Raven's Standard Progressive Matrices at ages 8 to 12. The mean IQ score across the sample (n = 1645) was 114.2. After controlling for multiple confounders for every 1-cm increment in birth length, 1 kg in birth weight, or 1 cm in head circumference, there was a corresponding increase in IQ of 0.49 points (P for trend < .001), 2.19 points (P for trend = .007) and .62 points (P for trend = .003), respectively. These associations persisted even after exclusion of premature children and children with extreme weights and head circumferences. CONCLUSIONS: Longer birth length, higher birth weight, or larger head circumferences within the normal birth size range are associated with higher IQ scores in Asian children.
Keyword(s):birth length, birthweight, head circumference, Intellectual quotient, IQ
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