Table 2.
Summary of Kaplan-Meier Survivor Density Function Estimates.
| Nitrous Oxide N = 97 | Nitrogen N = 107 | |||||||
| Time | Survival (95% CI) | # Events | # Censored* | # Left | Survival (95% CI) | # Events | # Censored* | # Left |
| 6 Months | 89 (83, 96) | 10 | 3 | 84 | 90 (85, 96) | 10 | 3 | 94 |
| 1 Year | 81 (73, 89) | 18 | 4 | 75 | 82 (74, 89) | 19 | 4 | 84 |
| 2 Years | 70 (61, 79) | 28 | 6 | 63 | 71 (62, 80) | 30 | 5 | 72 |
| 3 Years | 67 (57, 76) | 31 | 10 | 56 | 68 (59, 77) | 33 | 8 | 66 |
| 5 Years | 60 (50, 71) | 36 | 29 | 32 | 61 (51, 71) | 38 | 37 | 32 |
| Last Observation | 49 (34, 64) | 39 | 58 | 0 | 61 (51, 71) | 38 | 69 | 0 |
* Lost to follow-up before observed recurrence.