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Table 2 Kaplan-Meier product limit estimates of probabilities of success

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

Age group, years Probability of success (95% CI)
  With fascial interposition Without fascial interposition
  Azoospermia, 14 weeks
Overall 71% (67, 76) 61% (56, 66)
<30 91% (85, 97) 62% (51, 72)
30 to 34 71% (63, 80) 64% (56, 73)
35 to 39 69% (59, 79) 64% (54, 73)
40+ 48% (37, 59) 53% (44, 63)
  Azoospermia, 34 weeks
Overall 86% (82, 91) 83% (78, 87)
<30 95% (90, 99) 80% (71, 90)
30 to 34 85% (77, 93) 81% (74, 86)
35 to 39 89% (81, 97) 88% (81, 95)
40+ 75% (59, 91) 81% (72, 90)
  Severe Oligozoospermia, 14 weeks
Overall 91% (88, 94) 82% (78, 86)
<30 94% (89, 99) 77% (68, 87)
30 to 34 89% (83, 95) 82% (75, 89)
35 to 39 91% (85, 97) 84% (76, 91)
40+ 91% (85, 97) 83% (76, 90)
  Severe Oligozoospermia, 34 weeks
Overall 94% (92, 97) 87% (84, 91)
<30 95% (90, 99) 86% (80, 96)
30 to 34 92% (87, 97) 87% (81, 93)
35 to 39 96% (91, 100) 89% (82, 96)
40+ 95% (89, 100) 86% (79, 93)
  1. CI: Confidence interval