Table 1 Characteristics of mothers and their children (N = 7670)
Characteristics | Valuea |
|---|---|
Maternal characteristics | |
 Age, median (IQR), years | 30.3(25.9 to 33.4) |
 < 25, no. (%) | 1573(20.5) |
 25–35, no. (%) | 4972(64.8) |
 > 35, no. (%) | 1125(14.7) |
 Height, mean (SD) (cm) | 167.3(7.4) |
 Weight, mean (SD) (kg) | 69.3(13.2) |
 Body mass index1, mean (SD) (kg/m2) | 24.8(4.5) |
 Normal, no. (%) | 4709(61.8) |
 Overweight, no. (%) | 1979(26.0) |
 Obese, no. (%) | 932(12.2) |
 Education, no. higher education (%) | 3055(42.9) |
Race/ethnicity, no. (%) | |
 Dutch or European, no. (%) | 4289(58.2) |
 Surinamese, no. (%) | 655(8.9) |
 Turkish, no. (%) | 673(9.1) |
 Moroccan, no. (%) | 473(6.4) |
 Cape Verdian or Dutch Antilles, no. (%) | 560(7.6) |
 Parity, no. nulliparous (%) | 4308(56.6) |
Smoking, no. (%) | |
 None, no. (%) | 4967(72.8) |
 Early pregnancy only, no. (%) | 595(8.7) |
 Continued, no. (%) | 1261(18.5) |
Birth characteristics | |
 Males, no. (%) | 3861(50.3%) |
 Gestational age, median (IQR), weeks | 40.1(39.1 to 41.0) |
 Birth weight, mean (SD) grams | 3423(544) |
 Preterm birth2, no. (%) | 345(4.5) |
 Spontaneous preterm birth, no. (%) | 294(3.0) |
 Small-size for gestational age3 < 10 birth centile (<− 1.4SDS), no. (%) | 768(10) |
 Large-size for gestational age3 > 90 birth centile (> 1.18SDS), no. (%) | 767(10) |
 Cesarean delivery, no. (%) | 836(11.9) |
 Assisted vaginal delivery, no. (%) | 964(13.8) |
 Apgar score below 7 at 5 min, no. (%) | 78(1.0) |