Maternal and infant characteristics by employment status, Amsterdam Born Children and their Development study, Amsterdam, the Netherlands, 2003–2004 (N=7561)
| Employed | Unemployed | |
| N=4865 | N=2696 | |
| Mean (SD) or % | Mean (SD) or % | |
| Maternal age (years) | 31.8 (4.3) | 29.7 (5.5) |
| Pre-pregnancy body mass index (kg/m2) | 22.8 (3.5) | 23.9 (4.6) |
| Parity (% primiparae) | 61.8 | 40.2 |
| Education (years) | 9.9 (3.4) | 6.6 (4.3) |
| Marital status (% single) | 9.8 | 17.8 |
| Smoked while pregnant (% yes) | 8.4 | 10.6 |
| Alcohol use while pregnant (% yes) | 26.6 | 12.4 |
| Ethnicity | ||
| Dutch | 68.4 | 26.9 |
| Surinamese/Antillean | 7.3 | 11.4 |
| Turkish/Moroccan | 5.5 | 29.4 |
| Other Western | 4.2 | 21.4 |
| Other non-Western | 14.6 | 10.8 |
| Hypertensive disorder (%) | ||
| No | 81.4 | 89.7 |
| Pre-existent hypertension | 3.3 | 4.5 |
| Pregnancy-induced hypertension | 15.3 | 5.4 |
| Previous preterm birth (% yes) | 0.8 | |
| Gestational age (weeks) | 40.1 (1.2) | 40.0 (1.2) |
| Birth weight (g) | 3510 (483) | 3478 (482) |
| Gender of the baby (% boys) | 50.1 | 50.7 |
| Preterm birth (% yes) | 5.2 | 5.7 |