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Table 4 Adjusted odds ratio and 95% confidence intervals for all independent variables from ordinal logistic regression analysis of postpartum hemorrhage

From: Differential effects of different delivery methods on progression to severe postpartum hemorrhage between Chinese nulliparous and multiparous women: a retrospective cohort study

Variables Nulliparous Multiparous
Core differentiated variables
 Delivery method
 Cesarean section 2.04 (1.40–2.97) 4.32 (3.03–6.14)
 VD- Episiotomy 1.55 (0.92–2.60) 1.24 (0.96–1.62)
 VD- Forceps-assisted 1.70 (0.91–3.18) 9.32 (3.66–23.71)
 VD- Vacuum-assisted 1.05 (0.40–2.73) 2.41 (0.36–16.29)
 SVD without any instruments Reference
Placenta previa 4.97 (3.50–7.07) 8.64 (5.84–12.80)
Placenta accreta 10.45 (5.77–18.90) 70.21 (1.20–411.96)
Placental abruption 3.19 (2.26–4.50) 4.25 (2.57–7.01)
Placental retention 5.35 (3.47–8.24) 8.16 (4.80–13.89)
Uterine inertia 3.03 (1.48–6.21) 5.54 (1.76–17.50)
Vertex malposition 0.87 (0.63–1.22) 1.93 (1.25–3.00)
Respiratory disease 2.63 (1.75–3.94) 3.26 (1.53–6.93)
Hepatopathy 8.92 (2.31–34.48) 1.51 (0.80–2.86)
Nephropathy 1.90 (1.22–2.93) 5.55 (1.63–18.88)
Rhesus hemolytic disease 7.52 (3.11–18.17) 6.44 (2.94–14.08)
Coagulopathy 47.41 (23.32–96.37) 111.37 (2.27–546.2)
Other confounders
 Age (years)   
 16–19 1.32 (0.92–1.89) 2.38 (1.17–4.84)
 20–24 1.24 (1.11–1.39) 1.32 (1.00–1.74)
 25–29 Reference
 30–34 0.98 (0.88–1.09) 1.25 (0.98–1.59)
  > 34 1.23 (1.05–1.44) 1.36 (1.09–1.68)
 Admission
  Normal Reference
  Emergency 2.73 (0.96–7.76) 2.49 (1.12–5.54)
  Serious 1.60 (0.98–2.60) 1.71 (1.19–2.46)
Soft birth canal disorder 0.89 (0.65–1.20) 1.26 (0.84–1.89)
Cardio-cerebrovascular diseases 1.15 (0.90–1.46) 1.24 (0.91–1.67)
Venereal disease 3.05 (0.94–9.89) 2.42 (0.71–8.16)
 Gestation age (week)
  26–36 1.20 (0.95–1.50) 1.16 (0.84–1.60)
  37–39 0.90 (0.55–1.47) 1.09 (0.86–1.39)
  40–42 Reference
   > 42 1.56 (1.33–1.92) 1.48 (0.76–2.89)
 Neonatal birth weight (g)
  500–2499 0.83 (0.66–1.05) 0.99 (0.71–1.38)
  2500–3999 Reference
   > 4000 g 1.57 (1.31–1.72) 1.68 (1.23–1.96)
Twins or multiplets pregnancy 2.24 (1.65–3.05) 2.02 (1.05–3.88)
 Amniotic fluid volume abnormality
  None Reference
  Polyhydramnios 1.15 (0.80–1.67) 1.65 (0.78–3.49)
  Oligohydramnios 0.75 (0.60–0.92) 0.83 (0.61–1.12)
PROM 0.74 (0.60–0.92) 1.02 (0.75–1.40)
  1. Note: SVD Spontaneous vaginal delivery, PROM Premature rupture of membrane