Table 3 Kaplan-Meier survival probability data details
   Year | Number of atstart | Failures | Withdrawn | Number of risk | Accumulated survival (%) | 95% Confidence interval |
|---|---|---|---|---|---|---|
0 to 1 | 280 | 9 | 3 | 279.9 | 96.4 | 93.8 to 98.4 |
1 to 2 | 259 | 3 | 24 | 257.0 | 95.7 | 92.4 to 97.6 |
2 to 3 | 229 | 2 | 40 | 222.0 | 94.8 | 91.4 to 97.0 |
3 to 4 | 185 | 1 | 48 | 176.0 | 94.3 | 90.7 to 96.6 |
4 to 5 | 135 | 1 | 53 | 124.5 | 93.5 | 89.9 to 96.1 |
5 to 6 | 80 | 0 | 43 | 75.5 | 98.5 | 89.9 to 96.1 |
6 to 7 | 37 | 0 | 29 | 29.5 | 93.5 | 88.8 to 95.3 |