Adriëtte Oostvogels

7 Response (n=1459) Non-response (n=4478) N / mean % / SD N / mean % / SD Maternal characteristics Maternal age (years) 32.4 4.3 30.5 5.3 P<0.001 Maternal BMI (kg/m 2 ) 22.8 3.6 23.0 4.0 Maternal education (years after primary school) 10.1 3.5 8.8 4.0 P<0.001 Parity Primiparous (ref) 809 55% 2510 56% Multiparous 650 45% 1968 44% Ethnicity Dutch (ref) 1152 79% 2877 64% P<0.001 Turkish 25 4% 236 5% P<0.001 Moroccan 59 2% 394 9% Other non-Western 130 9% 754 17% Other Western 93 6% 208 5% Smoking during pregnancy No (ref) 1342 92% 4016 90% P<0.05 Yes 117 8% 460 10% Hypertension No (ref) 1292 89% 3926 88% Pregnancy induced 125 9% 397 9% Pre-existent 42 3% 155 3% Child’s characteristics Birth weight (g) 3540 503 3424 560 P<0.001 Gestational age (weeks) 40.0 1.4 39.8 1.8 P<0.001 Sex Boy 770 53% 2184 49% P<0.01 Girl 689 47% 2294 51% Supplementary Table 1. Non-response analysis (N=5937) 195 pBMI, postnatal growth and offspring’s CMP