Table 1 The distribution of maternal characteristics stratified by parity
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 |