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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