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Mean full-scale IQ score by gestational age in completed weeks among the PROBIT children recruited in 1996–1997 and followed up at age 6.5 years. Mean full-scale IQ scores were based on 469 children at 37 weeks of gestation, 2,100 children at 38 weeks, 4,194 children at 39 weeks, 5,956 children at 40 weeks, 924 children at 41 weeks, 171 children at 42 weeks, and 10 children at 43 weeks. IQ, intelligence quotient; PROBIT, Promotion of Breastfeeding Intervention Trial.
