Table 1 Characteristics of Women with and without Prelabour Rupture of Membranes at Preterm Delivery
|  | Prelabour Rupture of Membranes N = 47 | No Prelabour Rupture of Membranes N = 189 | Odds Ratio (95%CI) | p value |
|---|---|---|---|---|
Age (years) Mean (SD) | 26.9 (6.6) | 26.4 (6.8) | Â | 0.606 |
Category N (%) | ||||
  ≤ 19 | 9 (19.2) | 32 (16.9) |  | 0.830 |
  > 19 | 38 (80.8) | 157 (83.1) | 1.2 (0.5–2.6) |  |
Parity Mean (SD) | 1.3 ± 1.3 | 1.3 ± 1.3 |  | 0.607 |
Category N (%) | ||||
 0 | 17 (36.2) | 61 (32.3) | 0.9 (0.5–1.9) | 1.000 |
  ≥ 1 | 30 (63.8) | 128 (67.7) |  |  |
Previous Pregnancy Complications N (%) | ||||
 Yes | 23 (71.9) | 68 (53.1) | 2.3 (0.9–5.3) | 0.072 |
 No | 7 (23.3) | 60 (46.9) |  |  |
Antenatal Booking N (%) | ||||
 Yes | 42 (89.4) | 175 (93.6) | 0.7 (0.2–2.3) | 0.745 |
 No | 5 (10.6) | 12 (6.4) |  |  |
 Missing Data | – | 2 |  |  |
Gestational Age at Booking (weeks) Mean (SD) | 20.6 ± 6.7 | 18.5 ± 7.4 |  | 0.103 |
Late ANC Booking (≥20wk) N (%) | ||||
 Yes | 26 (61.9) | 85 (48.6) | 1.7 (0.9–3.4) | 0.126 |
 No | 16 (38.1) | 90 (51.4) |  |  |
Body Mass Index Mean (SD) | 29.3 ± 7.8 | 27.9 ± 5.8 |  | 0.562 |
BMI Category N (%) | ||||
  < 30 | 17 (60.7) | 96 (70.6) | 1.5 (0.7–3.6) | 0.370 |
  ≥ 30 | 11 (39.3) | 40 (29.9) |  |  |
 Missing data | 9 | 53 |  |  |
History of Smoking N (%) | ||||
 Yes | 6 (13.6) | 11 (6.1) | 2.4 (0.9–6.9) | 0.111 |
 No | 38 (86.4) | 169 (93.9) |  |  |
 Missing data | 3 | 9 |  |  |
Alcohol Intake N (%) | ||||
 Yes | 3 (6.8) | 16 (8.9) | 0.8 (0.2–2.7) | 0.773 |
 No | 41 (93.2) | 164 (91.1) |  |  |
 Missing data | 3 | 9 |  |  |
HIV Infection N (%) | ||||
 Positive | 23 (48.9) | 90 (47.6) | 1.0 (0.5–1.9) | 1.000 |
 Negative | 24 (51.1) | 96 (50.8) |  |  |
 Unknown Status |  | 3 (1.6) |  |  |
Syphilis N (%) | ||||
 Positive | 0 (0) | 7 (3.8) | – | 0.352 |
 Negative | 43 (100) | 177 (96.2) |  |  |
 Missing data | 4 | 5 |  |  |