Predictive ability of the OFS compared with other indices for 90-day mortality
| Index | AUC (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | P value for difference in AUC |
| OFS | 0.76 (0.74 to 0.78) | 0.81 (0.76 to 0.85) | 0.59 (0.53 to 0.62) | Reference |
| NHFS | 0.75 (0.73 to 0.78) | 0.62 (0.56 to 0.68) | 0.75 (0.69 to 0.78) | 0.337 |
| Sernbo Score | 0.73 (0.70 to 0.75) | 0.62 (0.56 to 0.68) | 0.73 (0.67 to 0.76) | 0.002 |
| CCI | 0.70 (0.67 to 0.73) | 0.72 (0.67 to 0.77) | 0.55 (0.50 to 0.60) | <0.001 |
| 5-mFI | 0.68 (0.65 to 0.71) | 0.69 (0.63 to 0.74) | 0.59 (0.52 to 0.63) | <0.001 |
| ASA Classification | 0.67 (0.64 to 0.70) | 0.75 (0.70 to 0.79) | 0.52 (0.45 to 0.56) | <0.001 |
| RCRI | 0.59 (0.56 to 0.62) | 0.62 (0.57 to 0.68) | 0.52 (0.46 to 0.57) | <0.001 |
ASA, American Society of Anesthesiologists; AUC, area under the receiver-operating characteristic curve; CCI, Charlson Comorbidity Index; 5-mFI, 5-factor modified Frailty Index; NHFS, Nottingham Hip Fracture Score; OFS, Orthopedic Hip Frailty Score; RCRI, Revised Cardiac Risk Index.