Table 3. Unadjusted and multivariable-adjusted Cox’s proportional hazard regressions for the primary outcome 30-day mortality.
| Parameter | Unadjusted | Multivariable-adjusted | ||||
|---|---|---|---|---|---|---|
| HR | 95% CI | p-value | HR | 95% CI | p-value | |
| Period | 5 | 1.4–18 | 0.013 | 8.7 | 2.15–35 | 0.002 |
| Period * | - | - | - | 5.5 | 1.44–21 | 0.01 |
| Charlson | 1.11 | 0.93–1.33 | 0.217 | 1.04 | 0.82–1.32 | 0.69 |
| Charlson * | 1.09 | 0.92–1.28 | 0.312 | 0.96 | 0.79–1.16 | 0.68 |
| Sex (h) | 3.44 | 1.19–9.9 | 0.01 | 1.13 | 0.98–10 | 0.052 |
| Sex (h) * | - | - | - | 3.5 | 1.2–10 | 0.022 |
| Age | 1.03 | 0.96–1.09 | 1 | - | - | - |
| ADL | 0.69 | 0.53–0.9 | 0.006 | 0.6 | 0.45–0.82 | 0.001 |
| ADL * | 0.68 | 0.52–0.88 | 0.004 | 0.5 | 0.37–0.87 | 0.009 |
| IADL | 0.78 | 0.53–1.15 | 0.4 | - | - | - |
| IADL * | 0.79 | 0.55–1.12 | 0.18 | 1.9 | 0.69–1.91 | 0.57 |
| COVID infection | 2.5 | 0.7–9 | 0.15 | 0.44 | 0.1–1.9 | 0.28 |
| COVID infection * | - | - | - | 0.68 | 0.16–2.90 | 0.63 |
| Delay | 0.89 | 0.65–1.24 | 0.52 | - | - | - |
| Diagnosis£ | 1.4 | 0.47–4.1 | 0.54 | - | - | - |
Parameters with a p-value less than 0.2 in the unadjusted analysis were included in the multivariable Cox’s PH regression. £ diagnosis either AO31A or AO31B fracture.
* results after Multivariate Imputation by Chained Equation (MICE) approach.