Figure 2.

Adjusted odds ratios for associations between reported maternal iron supplement intake during the index period (from 3 months before pregnancy through the end of pregnancy and during breastfeeding) and autism spectrum disorder, Childhood Autism Risks from Genetics and the Environment (CHARGE) Study, California, 2003–2009. Odds ratios were adjusted for maternal folic acid intake during the first month of pregnancy, child's year of birth, and home ownership. Vertical bars represent 95% confidence intervals. Frequencies and P values are presented in Web Table 2. There was a significant association with autism spectrum disorder during the breastfeeding (BF) period (P < 0.05) and a borderline-significant association during months 4, 5, 6, and 9 of pregnancy (P < 0.10).