Table 2.
Risk and hazard rates at day 0 and day 1 combined and from post-operative day 2 to end of follow-up, respectively
| Day 0 and day 1 combined | From post-operative day 2 to end of follow-up | |||
|---|---|---|---|---|
| Parameter | Unadjusted | Adjusteda | Unadjusted | Adjusteda |
| RR (95 % CI) p value | RR (95 % CI) p value | RR (95 % CI) p value | RR (95 % CI) p value | |
| Fixation, uncemented | Ref. | Ref. | Ref. | Ref. |
| Cemented | 2.8 (1.6–5.1) 0.001 | 2.9 (1.6–5.2) 0.001 | 0.93 (0.87–1.0) 0.053 | 0.96 (0.89–1.03) 0.267 |
| ASA (per 1 unit increase) | 3.6 (2.7–4.8) <0.001 | 3.2 (2.4–4.4) <0.001 | 1.9 (1.7–1.9) <0.001 | 1.58 (1.50–1.66) <0.001 |
| Age (per 1 unit increase) | 1.1 (1.1–1.2) <0.001 | 1.1 (1.1–1.2) <0.001 | 1.06 (1.06–1.07) <0.001 | 1.05 (1.05–1.06) <0.001 |
| Sex, male | Ref. | Ref. | Ref. | Ref. |
| Female | 0.9 (0.6–1.3) 0.635 | 0.9 (0.6–1.4) 0.676 | 0.61 (0.57–0.61) <0.001 | 0.59 (0.55–0.63) <0.001 |
| Dementia, no | Ref. | Ref. | Ref. | Ref. |
| Unsure | 1.5 (1.0–2.2) 0.045 | 1.0 (0.7–1.5) 0.979 | 2.0 (1.8–2.2) <0.001 | 1.63 (1.48–1.78) <0.001 |
| Dementia | 2.1 (1.3–3.3) 0.002 | 1.3 (0.8–2.2) 0.225 | 2.8 (2.6–3.0) <0.001 | 2.35 (2.20–2.51) <0.001 |
| Time from fracture to operation (per 6 h increase) | 1.2 (1.0–1.4) 0.032 | 1.1 (0.9–1.3) 0.303 | 1.1 (1.0–1.1) <0.001 | 1.03 (1.00–1.06) 0.026 |
Cox regression analyses of data from post-operative day 2 to the end of follow-up; it was statistically estimated as hazard ratio
RR risk ratio, CI confidence interval
aValues adjusted for other risk factors (age, sex, cementation, ASA score, dementia and time from fracture to surgery)