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Table 3 Vasectomy failures based on semen analysis, by treatment and age group

From: Vasectomy by ligation and excision, with or without fascial interposition: a randomized controlled trial [ISRCTN77781689]

Age group, years Number and percentage of failures (95% CI)
  With fascial interposition Without fascial interposition
Overall 24 5.9% (3.8, 8.6) 53 12.7% (9.7, 16.3)
<30 5 4.6% (1.5, 10.4) 12 14.1% (7.5, 23.4)
30 to 34 10 7.9% (3.8, 14.0) 19 15.1% (9.3, 22.5)
35 to 39 6 6.3% (2.3, 13.1) 10 9.6% (4.7, 17.0)
40+ 3 3.6% (0.7, 10.1) 12 11.9% (6.3, 19.8)
  1. CI: Confidence interval