年份

既往剖宫产史

[n (%)]

宫腔 操作史

[n (%)]

剖宫产

[n (%)]

子宫破裂

[n (%)]

前置胎盘

[n (%)]

胎盘早剥

[n (%)]

软产道 裂伤

[n (%)]

宫缩乏力

[n (%)]

胎盘植入

[n (%)]

凝血功能障碍

[n (%)]

子宫 切除术

[n (%)]

≤20

13 (2.74)

112 (23.58)

153 (32.21)

1 (0.26)

4 (1.03)

10 (2.57)

10 (2.57)

4 (1.03)

14 ( 3.49)

4 ( 1.03)

3 0.77)

20~

1262 (9.41)

4408 (32.86)

5116 (38.14)

20 (0.17)

233 (2.04)

199 (1.74)

370 (3.23)

185 (1.62)

299 (2.56)

27 (0.24)

16 (0.14)

30~

2861 (27.76)

5645 (54.76)

5432 (52.68)

28 (0.30)

341 (3.71)

191 (2.08)

170 (1.85)

185 (2.01)

202 (2.16)

34 (0.37)

38 (0.41)

≥40

198 (30.89)

447 (69.84)

407 (63.49)

3 (0.50)

27 (4.52)

14 (2.35)

11 (1.84)

7 ( 1.17)

12 (1.98)

2 (0.34)

7 (1.17)

合计

4334 (17.45)

10612 (42.72)

11108 (44.71)

52 (0.24)

605 (2.8)

414 (1.91)

561 (2.59)

381

(1.76)

527 (2.39)

67 (0.31)

64 (0.30)

χ²

1410.248

1376.137

607.405

4.549

61.899

2.233

32.285

2.783

5.397

0.401

17.366

P

<0.001

<0.001

<0.001

0.033

<0.001

0.135

<0.001

0.095

0.020

0.527

<0.001