Table 1.
Life table for survival of the uncemented Reflection acetabular component
| Years since operation | Number at start | Failure | Withdrawn | Number at risk | Annual failure rate (%) | Cumulative survival | 95 % confidence interval | |
|---|---|---|---|---|---|---|---|---|
| Lower | Upper | |||||||
| 0–1 | 104 | 2 | 1 | 103.5 | 1.9 | 98.1 | 96.7 | 99.4 |
| 1–2 | 101 | 2 | 1 | 100.5 | 2.0 | 96.1 | 94.3 | 98.0 |
| 2–3 | 98 | 0 | 2 | 97 | 0.0 | 96.1 | 93.8 | 98.4 |
| 3–4 | 96 | 0 | 3 | 94.5 | 0.0 | 96.1 | 93.5 | 98.8 |
| 4–5 | 93 | 3 | 0 | 93 | 3.2 | 93.0 | 90.3 | 95.8 |
| 5–6 | 90 | 3 | 4 | 88 | 3.4 | 89.8 | 87.0 | 92.7 |
| 6–7 | 83 | 0 | 1 | 82.5 | 0.0 | 89.8 | 86.8 | 92.9 |
| 7–8 | 82 | 3 | 1 | 81.5 | 3.7 | 86.5 | 83.5 | 89.6 |
| 8–9 | 78 | 4 | 1 | 77.5 | 5.2 | 82.1 | 79.1 | 85.1 |
| 9–10 | 73 | 3 | 6 | 70 | 4.3 | 78.6 | 75.6 | 81.6 |
| 10–11 | 64 | 1 | 14 | 57 | 1.8 | 77.2 | 73.9 | 80.5 |
| 11–12 | 49 | 2 | 16 | 41 | 4.9 | 73.4 | 70.1 | 76.7 |
| 12–13 | 31 | 1 | 15 | 23.5 | 4.3 | 70.3 | 66.9 | 73.7 |
| 13–14 | 15 | 0 | 14 | 8 | 0.0 | 70.3 | 66.6 | 74.0 |