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Table 1 The distribution of maternal characteristics 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(%)
Maternal characteristics
 Age (years)    <0.01
  16–19 1727(1.53)# 452(1.18)  
  20–24 22,828 (20.22) 6707 (17.45)  
  25-29b 52,846 (46.80) 16,824 (43.78)  
  30–34 23,992 (21.25) 9733 (25.33)  
   > 34 11,514 (10.20) 4710 (12.26)  
 Admission    <0.01
  Normalb 100,793 (89.27) 36,201 (94.21)  
  Emergency 4500(3.99) 179(0.47)  
  Serious 7614(6.74) 2046(5.32)  
Uterine inertiac 3639(3.22) 466(1.21) <0.01
Soft birth canal tumour 4002(3.54) 559(1.45) <0.01
Preeclampsia 6551(5.80) 890(2.32) <0.01
Cardiovascular diseases 7007(6.21) 1011(2.63) <0.01
Respiratory disease 374(0.33) 44(0.11) <0.01
Hepatopathy 2989(2.65) 548(1.43) <0.01
Nephropathy 641(0.57) 49(0.13) <0.01
Venereal disease 356(0.32) 65(0.17) <0.01
Rhesus hemolytic disease 277(0.25) 53(0.14) <0.01
Coagulopathy 64(0.06) 4(0.01) <0.01
  1. Note: #The percentage is the proportion of the row total, not column total. The percentages are compared vertically, not horizontally. a p-values were derived from the chi-square test; b Reference group; c Including psychological and anesthetic factors, meanwhile excluded the uterine inertia cases that were caused by other factors mentioned in the same model