Table 2.

Relationship between sterilization duration and pregnancy rate after anastomosis

Duration (year)	Number of case	Rate of pregnancy(%)
<6	37	81.08%(30/37) χ2:12.59: P < 0.005
6–10	73	79.45%(58/73) χ2:14.35: P < 0.005
11–14	30	46.66%(14/30) χ2:1.66: P > 0.1
> 15	16	25%(4/16)
Total	156	67.94%(106/156)