Association of maternal dietary vitamin B-12 intake during pregnancy with offspring IQ at age 8. N = 4787 with complete data on exposure, outcome and covariables in any model.

Model 1: Adjusted for offspring sex and age at time of IQ assessment, and maternal energy intake. Model 2: As model 1 plus additional adjustment for potential confounding by maternal education, social class, age at delivery, parity, infection in pregnancy, ever smoked, alcohol consumption before and during pregnancy, and folate supplementation. Model 3: As model 2 plus additional adjustment for potential mediation by gestational length, birth-weight and breastfeeding duration.