“…Information on maternal age (year in continuous), maternal prepregnancy body mass index (BMI) (kg/m 2 in continuous), maternal education level (low: < 3 years of high school; intermediate: 3+ years of secondary education; and, high: university degree or higher vocational training), maternal ethnicity (Dutch national origin, other-Western, and non-Western), household income (<1200 euro/month, 1200–2000 euro/month, >2000 euro/month), marital status (married/partner, single), parity (0, 1, or 2+), maternal smoking (no smoking, smoked until pregnancy recognized, and continued smoking during pregnancy), maternal alcohol use (no alcohol consumption, alcohol consumption until pregnancy recognized, continued occasionally (<1 glass/week for at least two trimesters), and continued frequently (≥1 glass/week for at least two trimesters)), and maternal psychological dysfunction (score in continuous), using the Brief Symptom Inventory (BSI), was collected during pregnancy. Maternal IQ was determined using the computerized Ravens Advanced Progressive Matrices Test, set I , when mother-child pairs visited the 6-year examination (score in continuous). Data on child sex (female, male) was collected at birth and child age at assessment (years in continuous) was reported during the 6-year examination.…”