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) |
aValues are observed data and represent means (SD), medians (IQR) or number of subjects (valid %). Abbreviations: IQR inter quartile range, SD standard deviation
1Body mass index is defined as normal (BMI < 25), overweight (BMI 25–30), obese (BMI > 30)
2Preterm birth is defined as birth < 37 weeks of gestational age
3SGA is defined as < 10th percentile of gestational age- and sex-adjusted birth weight; LGA is defined as > 90th percentile of gestational age- and sex-adjusted birth weight