因素

例数

未使用组

使用1~2次组

使用3~4次组

统计值

P值

胎龄(周)

6.768

0.343^g

<28

10

1 (10%)

5 (50%)

4 (40%)

≥28~<30

50

7 (14%)

11 (22%)

32 (64%)

≥30~<32

65

8 (12.3%)

14 (21.5%)

43 (66.2%)

≥32~<34

136

27 (19.9%)

36 (26.5%)

73 (53.7%)

出生体重(g)

2.11

0.928^g

<1000

9

1 (11.1%)

2 (22.2%)

6 (66.7%)

≥1000~<1500

62

11 (17.7%)

13 (21%)

38 (61.3%)

≥1500~<2500

181

29 (16%)

48 (26.5%)

104 (57.5%)

≥1500

9

2 (22.2%)

3 (33.3%)

4 (44.4%)