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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