Characteristics | Total n (%) | Case Births n (%) | Control Births n (%) | COR (95% CI) | p-value |
---|---|---|---|---|---|
Total | 713 | 229 | 484 | Â | Â |
Gestational age at delivery a | 599 | 153 | 446 | Â | Â |
 Median | 38 (37–40) | 37 (36–39) | 38 (37–40) |  |  |
 Means | 37.91 (± 2.78) | 36.90 (± 3.36) | 38.26 (± 2.46) |  | <  0.001 |
Birth outcome | (653) | (169) | (484) | Â | Â |
 Live birth | 582 (89.1) | 145 (85.8) | 437 (90.3) | 1.0 |  |
 Fresh stillbirth | 42 (6.4) | 10 (5.9) | 32 (6.6) | 0.94 (0.45–1.96) | 0.873 |
 Macerated stillbirth | 29 (4.4) | 14 (8.3) | 15 (3.1) | 2.81 (1.33–5.97) | 0.005 |
Delivery mode | (653) | (169) | (484) | Â | Â |
 Vaginal spontaneous | 465 (71.2) | 113 (66.9) | 352 (72.7) | 1.0 |  |
 Vaginal operative | 39 (6.0) | 4 (2.4) | 35 (7.2) | 0.36 (0.12–1.02) | 0.046 |
 Caesarean section | 149 (22.8) | 52 (30.8) | 97 (20.0) | 1.67 (1.12–2.49) | 0.011 |
Preterm birth b | (598) | (153) | (445) | Â | Â |
 Yes | 130 (21.7) | 67 (43.8) | 63 (14.3) | 4.72 (3.12–7.16) | <  0.001 |
 No | 468 (78.3) | 86 (56.2) | 382 (85.7) | 1.0 |  |
Birth weight c | (543) | (132) | (411) | Â | Â |
  < 2500 g | 75 (13.8) | 40 (30.3) | 35 (8.5) | 4.67 (2.81–7.76) | <  0.001 |
  ≥ 2500 g | 468 (86.2) | 92 (69.7) | 376 (91.5) | 1.0 |  |