Table 1.
Characteristics of the women
| N | (%) | General pregnant population in the Netherlands (%)a | |
|---|---|---|---|
| Age (years) | |||
| 20–34 | 208 | (63) | (75.3) |
| 35–39 | 94 | (29) | (21.3) |
| ≥ 40 | 25 | (8) | (3.4) |
| BMI (kg/m2) | |||
| < 18,5 | 15 | (5) | (3.1) |
| 18,5–24,9 | 137 | (42) | (65.2) |
| 25,0–29,9 | 39 | (12) | (21.9) |
| ≥ 30 | 24 | (7) | (9.8) |
| Unknown | 112 | (34) | – |
| Geographical ethnic origin | |||
| The Netherlands | 223 | (68) | N/A |
| Other European Countries | 7 | (2) | N/A |
| Non-Western immigrants; | 70 | (22) | (16.8) |
| Middle East/North Africa | 28 | (7) | N/A |
| Sub-Saharan Africa | 17 | (5) | N/A |
| South America | 16 | (5) | N/A |
| Far East | 9 | (3) | N/A |
| Unknown | 27 | (8) | – |
| Parity | |||
| 0 | 158 | (48.3) | (45.2) |
| 1–2 | 145 | (44.3) | (49.8) |
| ≥ 3 | 24 | (7.3) | (5.0) |
| Previous postpartum hemorrhage | 40 | (12) | N/A |
| Previous cesarean section | 66 | (20) | (6.0) |
N/A data not available
aNational reference values from Statistics Netherlands (exact study period) [16]