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Cumulative reoperation rate with 95% confidence intervals presented by fracture type
| Fracture type Time, years | No. at risk | Cumulative events | CRR (95% CI) |
|---|---|---|---|
| Undisplaced femoral neck fracture (n = 407) | |||
| 1 | 383 | 12 | 3.0 (1.3–4.6) |
| 2 | 302 | 21 | 5.4 (31–7.7) |
| 3 | 197 | 25 | 6.9 (4.2–9.5) |
| 4 | 134 | 27 | 8.0 (4.9–11) |
| 5 | 73 | 27 | 8.0 (4.9–11) |
| Displaced femoral neck fracture (n = 389) | |||
| 1 | 345 | 35 | 9.2 (6.2–12) |
| 2 | 229 | 63 | 17 (13–21) |
| 3 | 161 | 73 | 22 (17–26) |
| 4 | 111 | 78 | 24 (19–29) |
| 5 | 64 | 79 | 25 (20–30) |
CRR: cumulative reoperation rate.
