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Table 3 Adjusted odds ratios for risk factors of hysterectomy in women with postpartum haemorrhage

From: Risk factors for peripartum hysterectomy among women with postpartum haemorrhage: analysis of data from the WOMAN trial

Variable Model 1a   Model 2b  
AOR (95% CI)c P-value AOR (95% CI)c P-value
Cause of haemorrhage
 Uterine atony 1 < 0.001 1 < 0.001
 Surgical trauma/tears 1.42 (1.16–1.73)   1.21 (0.98–1.50)  
 Placenta praevia/accreta 3.17 (2.66–3.79)   2.25 (1.85–2.74)  
 Other/Unknown 1.34 (1.03–1.74)   0.97 (0.73–1.28)  
Age (years)
 < 20 1 < 0.001 1 < 0.001
 20–29 1.62 (0.90–2.93)   1.47 (0.80–2.72)  
 30–39 3.96 (2.20–7.14)   3.33 (1.82–6.12)  
 ≥40 7.59 (4.03–14.29)   5.89 (3.04–11.38)  
Geographic region
 Africa 1 0.01 1 < 0.001
 Asia 1.23 (0.91–1.66)   2.16 (1.52–3.08)  
 Europe and Americas 0.45 (0.23–0.89)   0.69 (0.32–1.47)  
Delivery in study hospital
 Yes 1 < 0.001 1 0.06
 No 1.60 (1.25–2.07)   0.77 (0.59–1.01)  
Uterotonic prophylaxis given
 Yes 1 < 0.001 1 < 0.001
 No 2.68 (1.77–4.06)   2.57 (1.62–4.09)  
Type of delivery
 Vaginal 1 < 0.001 1 < 0.001
 Caesarean 4.26 (3.60–5.04)   2.32 (1.92–2.80)  
Systolic blood pressure (mmHg)
 ≤70    2.26 (1.79–2.87) < 0.001
 71–90    1.68 (1.40–2.01)  
 > 90    1  
Estimated volume of blood loss (mL)
 ≤ 1000    1 < 0.001
 1001–1500    2.89 (2.19–3.83)  
 > 1500    12.88 (9.78–16.95)  
Clinical signs of haemodynamic instability
 No    1 < 0.001
 Yes    3.50 (2.74–4.47)  
  1. aModel 1: cause of haemorrhage, age, geographic region, delivery in study hospital, uterotonic prophylaxis given and type of delivery
  2. bModel 2: model 1 plus systolic blood pressure, estimated volume of blood loss and clinical signs of haemodynamic instability
  3. cAOR: Adjusted odds ratio; CI: Confidence interval
  4. P-values obtained from likelihood ratio test