Adriëtte Oostvogels

6 Response (N=3508) Non-response (N=2756) Maternal age (years) 31.8 (4.6) 30.0 (5.4) P<0.001 Maternal height (cm) 169.3 (7.1) 167.3 (7.2) P<0.001 Maternal pBMI (kg/m 2 ) 23.1 (3.8) 23.7 (4.2) P<0.001 Maternal education (%) 0-4 years 9.7 22.3 P<0.001 5-9 years 29.5 36.9 ≥ 10 years 60.8 40.7 Maternal ethnicity (%) Dutch 66.3 42.3 P<0.001 Surinamese 4.2 9.0 Moroccan 4.5 13.9 Turkish 3.8 7.1 Other 21.2 27.7 Parity (%) Nulliparous 57.5 53.2 P<0.001 Multiparous 42.5 46.8 Diabetes in pregnancy Yes % 1.9 2.3 P=0.095 Hypertension in pregnancy Yes % 13.5 8.7 P<0.001 Smoking during pregnancy Not 91.8 90.1 P=0.011 1-5 4.6 4.8 >5 3.6 5.1 Foetal sex Boys % 48.8 50.4 P=0.232 Exclusive breastfeeding (%) < 1 month 24.0 27.9 P<0.001 1-3 months 26.9 30.3 > 3 months 49.1 41.8 Supplementary Table 1. Response – Non-response analysis 165 pBMI and offspring’s growth patterns