Table 3.
Difference in absolute risk of in-hospital mortality in hip fracture patients after IPW, stratified by frailty.
| Level of frailty | Surgery ≤24 h (%) | Surgery >24 h (%) | ARD (95% CI) | P-value |
|---|---|---|---|---|
| OFS 0 | 0.7 | 1.0 | 0.29 (0.22–0.37) | <0.001 |
| OFS 1 | 1.4 | 1.9 | 0.46 (0.34–0.58) | <0.001 |
| OFS 2 | 2.4 | 2.8 | 0.38 (0.15–0.61) | 0.001 |
| OFS 3 | 3.0 | 4.1 | 1.13 (0.61–1.65) | <0.001 |
| OFS ≥4 | 2.9 | 5.2 | 2.33 (0.57–4.09) | 0.010 |
Using IPW, all strata were balanced in regard to age, sex, race, highest AIS in each region, type of fracture, type of surgery, and comorbidities.
IPW, inverse probability weighting; ARD, absolute risk difference; CI, confidence interval; OFS, orthopedic frailty score; AIS, abbreviated injury scale.