Figure 3.
Associations between pre- and postnatal (at 24 months) exposure to HCB (ng/g) and the risk of ADHD (based on 100 ng/g lipid HCB increase). (a) Exposure at birth. (b) Exposure at 24 months. *Models were adjusted for: maternal pre-pregnancy body mass index (kg/m2, continuous), maternal age (years, continuous), maternal education (low, medium, high), maternal smoking during pregnancy (yes/no), maternal parity (nulliparous, yes/no) and child’s sex (male/female). **Models were also adjusted for duration of total breastfeeding (months, continuous).