Table 5 Caesarean section, preterm birth and low birthweight by parity, ART and plurality
From: Very advanced maternal age and morbidity in Victoria, Australia: a population based study
|  | 30–34 years | 45+ years | OR | 95% CI | p-value | ||
|---|---|---|---|---|---|---|---|
| Â | n | % | n | % | Â | Â | Â |
CS | Â | Â | Â | Â | Â | Â | Â |
  primip | 6,729 | 35.0 | 62 | 81.6 | 8.24 | (4.5, 15.4) | <0.0001 |
  Multi | 8,954 | 30.2 | 58 | 41.1 | 1.62 | (1.1, 2.3) | 0.0047 |
  ART | 673 | 50.0 | 46 | 85.2 | 5.75 | (2.5, 13.3) | <0.0001 |
  No ART | 15,010 | 31.6 | 74 | 45.4 | 1.80 | (1.3, 2.5) | 0.0001 |
  Singleton | 14,991 | 31.3 | 107 | 52.5 | 2.42 | (1.8, 3.2) | <0.0001 |
  Multiple | 692 | 70.4 | 13 | 100.0 | undefined |  | 0.0139* |
Preterm birth | Â | Â | Â | Â | Â | Â | Â |
  Primip | 1,766 | 9.0 | 20 | 23.5 | 3.13 | (1.8, 5.3) | <0.0001 |
  Multi | 1,930 | 6.4 | 18 | 12.4 | 2.08 | (1.2, 3.5) | 0.0032 |
  ART | 423 | 26.3 | 16 | 25.0 | 0.93 | (0.5, 1.7) | 0.8114 |
  No ART | 3,273 | 6.8 | 22 | 13.2 | 2.10 | (1.3, 3.4) | 0.0009 |
  Singleton | 2,594 | 5.4 | 22 | 10.8 | 2.11 | (1.3, 3.4) | 0.0007 |
  Multiple | 1,102 | 55.7 | 16 | 61.5 | 1.27 | (0.5, 3.0) | 0.5486 |
Low Birthweight | Â | Â | Â | Â | Â | Â | Â |
  Primip | 1,529 | 7.8 | 21 | 24.7 | 3.90 | (2.3, 6.6) | <0.0001 |
  Multi | 1,513 | 5.0 | 8 | 5.5 | 1.11 | (0.5, 2.3) | 0.7808 |
  ART | 357 | 22.2 | 15 | 23.4 | 1.07 | (0.6, 2.0) | 0.8218 |
  No ART | 2,685 | 5.6 | 14 | 8.4 | 1.56 | (0.9, 2.8) | 0.1070 |
  Singleton | 2,038 | 4.3 | 12 | 5.9 | 1.41 | (0.8, 2.6) | 0.2501 |
  Multiple | 1,004 | 50.8 | 17 | 65.4 | 1.83 | (0.8, 4.5) | 0.1397 |