时间(月)

组1

组2

P value

<=12

10(11.5%)

3(13.6%)

0.129a

13-24

17(19.5%)

2(9.1%)

25-36

28(32.2%)

3(13.6%)

37-48

12(13.8%)

4(18.2%)

49-60

5(5.7%)

6(27.3%)

>60

15(17.2%)

4(18.2%)