Table 1.
Study population demographics (mean ± SD) N = 6,161
| Maternal characteristics | Birth characteristics | ||
|---|---|---|---|
| Age (years) | 31.0 (± 5.1) | Gender (% girls) | 50.1% |
| Pre-pregnancy BMI (kg/m2) | 23.0 (± 3.6) | Gestational age (weeks) | 39.8 (± 1.7) |
| Educational level (years after primary school) | 9.1 (± 3.9) | % Preterm birth (<37 weeks) | 4.9% |
| % Primipara | 55.6% | Birthweight (g) | 3452 (± 550) |
| Ethnicity | % Small for gestational age | 11.8% | |
| % Dutch | 69.2% | ||
| % Surinamese | 5.0% | ||
| % Turkish | 3.4% | ||
| % Moroccan | 6.1% | ||
| % Other non-western | 9.4% | ||
| % Other western | 6.9% | ||
| Smoking during pregnancy | |||
| % Not smoking | 90.3% | ||
| % 0-5 cigarettes/day | 6.3% | ||
| % 6 or more cigarettes/day | 3.4% | ||
| % Consuming alcohol | 22.9% | ||
Characteristics of pregnant women and births in the Amsterdam Born Children and their Development (ABCD) Study (the Netherlands)