Table 3.
Cox regression analysis of risk of reoperation
| Factor | Univarible analyses HR (CI) | Multivariable analysis HR (CI) |
|---|---|---|
| Age | ||
| Per 1 year increase | 1.0 (0.99–1.01) | 1.0 (0.99–1.02) |
| Sex | ||
| Female | 1 | 1 |
| Male | 0.64 (0.44–0.93) | 0.57 (0.38–0.87) |
| ASA score | ||
| 1–2 | 1 | 1 |
| 3–4 | 1.3 (0.88–1.9) | 1.5 (0.96–2.2) |
| Hours to surgery | ||
| < 12 | 1 | 1 |
| 12–24 | 1.7 (1.1–2.6) | 1.7 (1.1–2.6) |
| 24–36 | 1.1 (0.53–2.1) | 0.94 (0.44–2.0) |
| > 36 | 0.95 (0.42–2.2) | 0.95 (0.40–2.3) |
| Test for overall effect | p = 0.05 | p = 0.06 |
| Cortical thickness index | ||
| Per 0.1 increase | 0.95 (0.76–1.2) | 1.0 (0.80–1.4) |
| Fracture type | ||
| Mildly displaced | 1 | 1 |
| Severely displaced | 2.5 (1.8–3.7) | 3.1 (2.0–4.7) |
| Reduction a | ||
| Fully reduced | 1 | 1 |
| Partly reduced | 1.6 (0.92–2.9) | 2.0 (1.1–3.8) |
| Not reduced | 1.8 (1.2–2.7) | 1.6 (1.1–2.5) |
| Test for overall effect | p < 0.01 | p = 0.03 |
| Angle of implants to the lateral cortex of the femoral shaft in AP | ||
| > 125° | 1 | 1 |
| ≤ 125° | 2.0 (1.0–3.8) | 1.7 (0.90–3.4) |
| Protrusion of implant | ||
| No protrusion | 1 | 1 |
| Protrusion | 2.1 (0.94–4.9) | 2.4 (1.0–5.5) |
aSee footnotes Table 2.