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Table 1 Characteristics of Women with and without Prelabour Rupture of Membranes at Preterm Delivery

From: Preterm prelabour rupture of membranes (PPROM) and pregnancy outcomes in association with HIV-1 infection in KwaZulu-Natal, South Africa

 Prelabour Rupture of Membranes N = 47No Prelabour Rupture of Membranes N = 189Odds Ratio (95%CI)p value
Age (years) Mean (SD)26.9 (6.6)26.4 (6.8) 0.606
Category N (%)
  ≤ 199 (19.2)32 (16.9) 0.830
  > 1938 (80.8)157 (83.1)1.2 (0.5–2.6) 
Parity Mean (SD)1.3 ± 1.31.3 ± 1.3 0.607
Category N (%)
 017 (36.2)61 (32.3)0.9 (0.5–1.9)1.000
  ≥ 130 (63.8)128 (67.7)  
Previous Pregnancy Complications N (%)
 Yes23 (71.9)68 (53.1)2.3 (0.9–5.3)0.072
 No7 (23.3)60 (46.9)  
Antenatal Booking N (%)
 Yes42 (89.4)175 (93.6)0.7 (0.2–2.3)0.745
 No5 (10.6)12 (6.4)  
 Missing Data2  
Gestational Age at Booking (weeks) Mean (SD)20.6 ± 6.718.5 ± 7.4 0.103
Late ANC Booking (≥20wk) N (%)
 Yes26 (61.9)85 (48.6)1.7 (0.9–3.4)0.126
 No16 (38.1)90 (51.4)  
Body Mass Index Mean (SD)29.3 ± 7.827.9 ± 5.8 0.562
BMI Category N (%)
  < 3017 (60.7)96 (70.6)1.5 (0.7–3.6)0.370
  ≥ 3011 (39.3)40 (29.9)  
 Missing data953  
History of Smoking N (%)
 Yes6 (13.6)11 (6.1)2.4 (0.9–6.9)0.111
 No38 (86.4)169 (93.9)  
 Missing data39  
Alcohol Intake N (%)
 Yes3 (6.8)16 (8.9)0.8 (0.2–2.7)0.773
 No41 (93.2)164 (91.1)  
 Missing data39  
HIV Infection N (%)
 Positive23 (48.9)90 (47.6)1.0 (0.5–1.9)1.000
 Negative24 (51.1)96 (50.8)  
 Unknown Status 3 (1.6)  
Syphilis N (%)
 Positive0 (0)7 (3.8)0.352
 Negative43 (100)177 (96.2)  
 Missing data45