Table 2 Kaplan-Meier estimates of the probabilities of vasectomy success (N = 389). Probabilities of success by follow up week and age (< 35 or ≥ 35 years) for success defined as oligozoospermia and azoospermia.
| Â | Probability of success defined as oligozoospermia1 (95% CI) | Probability of success defined as azoospermia2 (95% CI) | ||||
|---|---|---|---|---|---|---|
Follow-up week | All participants | Age < 35 years | Age ≥ 35 years | All participants | Age < 35 years | Age ≥ 35 years |
2 | 44.9% (39.9, 49.8) | 48.7% (40.8, 56.6) | 42.3% (36.0,48.7) | 25.8% (21.4, 30.1) | 22.7% (16.1, 29.3) | 27.8% (22.0, 33.5) |
5 | 74.5% (70.1, 78.9) | 77.9% (71.4, 84.5) | 72.2% (66.5, 78.0) | 58.2% (53.3, 63.1) | 61.0% (53.3, 68.7) | 56.3% (49.9, 62.7) |
8 | 87.7% (84.3, 91.0) | 90.0% (85.1, 95.0) | 86.1% (81.7, 90.6) | 73.6% (69.2, 78.1) | 77.6% (70.8, 84.3) | 71.0% (65.1, 76.9) |
12 | 94.9% (92.7, 97.1) | 97.2% (94.7, 99.6) | 93.5% (90.3, 96.7) | 85.3% (81.8, 88.9) | 91.8% (87.4, 96.3) | 81.1% (76.0, 86.2) |
16 | 97.1% (95.3, 98.8) | 97.9% (95.5, 100.0) | 96.5% (94.2, 98.9) | 90.2% (87.2, 93.3) | 93.9% (90.0, 97.8) | 87.9% (83.6, 96.3) |
20 | 98.4% (97.0, 99.8) | 99.3% (97.9, 100.0) | 97.8% (95.7, 99.9) | 94.0% (91.6, 96.5) | 95.9% (92.7, 99.1) | 92.8% (89.3, 96.3) |
24 | 98.4% (95.3, 100.0) | 99.3% (97.9, 100.0) | 97.8% (93.6, 100.0) | 98.0% (95.3, 100.0) | 98.2% (94.7, 100.0) | 98.1% (94.5, 100.0) |