组别

1月(%)

3月(%)

6月(%)

12月(%)

对照组(n = 29)

31.0% (9)

44.8% (13)

55.2% (16)

62.1% (18)

观察组(n = 28)

57.1% (16)

71.4% (20)

82.1% (23)

85.7% (24)

卡方值

3.944

4.135

4.796

4.108

P value

0.047

0.042

0.029

0.043