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Table 2 The distribution of neonatal characteristics and delivery methods stratified by parity

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 p-valuea
N = 112,907(%) N = 38,426(%)
Neonatal characteristics
 Gestation age    <0.01
  26-36w 17,513 (15.51)# 3556(9.25)  
  37-39w 43,734 (38.73) 14,740 (38.36)  
  40-42wb 50,526 (44.75) 19,880 (51.74)  
  Above 42w 1134(1.00) 250(0.65)  
 Neonatal birth weight    <0.01
  500-2499 g 11,613 (10.29) 2159(5.62)  
  2500–3999gb 89,868 (79.59) 33,970 (88.40)  
  above 4000 g 11,426 (10.12) 2297(5.98)  
Vertex malposition 3007(2.66) 98(0.26) <0.01
Twins or multiplets pregnancy 3285(2.91) 871(2.27) <0.01
Placenta previa 1833(1.62) 295(0.77) <0.01
Placenta accreta 92(0.08) 10(0.03) <0.01
Placental abruption 1167(1.03) 167(0.43) <0.01
Placental retention 541(0.48) 115(0.30) <0.01
 Amniotic fluid volume abnormality    <0.01
  Noneb 101,805 (90.17) 36,315 (94.51)  
  Polyhydramnios 716(0.63) 219(0.57)  
  Oligohydramnios 10,386(9.20) 1892(4.92)  
PROM 20,413 (18.08) 3895 (10.14) <0.01
Delivery methods    <0.01
 Cesarean section 50,543 (44.77) 104,44 (27.18)  
 VD- Episiotomy 12,961 (11.48) 10,184 (26.50)  
 VD- Forceps-assisted 650(0.58) 107(0.28)  
 VD- Vacuum-assisted 230(0.20) 56(0.15)  
 SVD without instrumentsb 48,523 (42.98) 17,635 (45.89)  
  1. Note: #The percentage is the proportion of the row total. The percentages are compared vertically, not horizontally. PROM Premature rupture of membrane, SVD Spontaneous vaginal delivery
  2. a, p-value derived from the chi-square test; b, Reference group