Clinical demographics stratified by the RCRI
| RCRI 0 N=79 941 | RCRI 1 N=36 848 | RCRI 2 N=13 086 | RCRI 3 N=3971 | RCRI ≥4 N=1069 | P value | |
| Age, mean (SD) | 81 (±11) | 83 (±9) | 84 (±8) | 83 (±8) | 82 (±8) | <0.001 |
| Sex, n (%) | <0.001 | |||||
| Female | 57 624 (72.1%) | 24 167 (65.6%) | 7605 (58.1%) | 2054 (51.7%) | 463 (43.3%) | |
| Male | 22 306 (27.9%) | 12 679 (34.4%) | 5481 (41.9%) | 1916 (48.2%) | 606 (56.7%) | |
| Missing | 11 (0.0%) | 2 (0.0%) | 0 (0.0%) | 1 (0.0%) | 0 (0.0%) | |
| ASA classification, n (%) | <0.001 | |||||
| 1 | 6195 (7.7%) | 361 (1.0%) | 82 (0.6%) | 17 (0.4%) | 1 (0.1%) | |
| 2 | 36 207 (45.3%) | 9976 (27.1%) | 1772 (13.5%) | 266 (6.7%) | 43 (4.0%) | |
| 3 | 32 391 (40.5%) | 22 481 (61.0%) | 8778 (67.1%) | 2586 (65.1%) | 621 (58.1%) | |
| 4 | 3551 (4.4%) | 3344 (9.1%) | 2224 (17.0%) | 1038 (26.1%) | 377 (35.3%) | |
| 5 | 53 (0.1%) | 47 (0.1%) | 18 (0.1%) | 10 (0.3%) | 7 (0.7%) | |
| Missing | 1544 (1.9%) | 639 (1.7%) | 212 (1.6%) | 54 (1.4%) | 20 (1.9%) | |
| CCI, n (%) | <0.001 | |||||
| ≤4 | 54 490 (68.2%) | 4882 (13.2%) | 237 (1.8%) | 2 (0.1%) | 0 (0.0%) | |
| 5–6 | 21 565 (27.0%) | 23 854 (64.7%) | 4642 (35.5%) | 180 (4.5%) | 6 (0.6%) | |
| ≥7 | 3886 (4.9%) | 8112 (22.0%) | 8207 (62.7%) | 3789 (95.4%) | 1063 (99.4%) | |
| Fracture type, n (%) | <0.001 | |||||
| Non-displaced cervical (garden 1–2) | 10 958 (13.7%) | 4694 (12.7%) | 1614 (12.3%) | 458 (11.5%) | 144 (13.5%) | |
| Displaced cervical (garden 3–4) | 29 757 (37.2%) | 13 676 (37.1%) | 4872 (37.2%) | 1473 (37.1%) | 394 (36.9%) | |
| Basicervical | 2619 (3.3%) | 1216 (3.3%) | 438 (3.3%) | 166 (4.2%) | 41 (3.8%) | |
| Pertrochanteric (two fragments) | 15 610 (19.5%) | 7503 (20.4%) | 2683 (20.5%) | 829 (20.9%) | 234 (21.9%) | |
| Pertrochanteric (multiple fragments) | 14 427 (18.0%) | 6738 (18.3%) | 2416 (18.5%) | 731 (18.4%) | 181 (16.9%) | |
| Subtrochanteric | 6531 (8.2%) | 3008 (8.2%) | 1060 (8.1%) | 314 (7.9%) | 75 (7.0%) | |
| Missing | 39 (0.0%) | 13 (0.0%) | 3 (0.0%) | 0 (0.0%) | 0 (0.0%) | |
| Type of surgery, n (%) | <0.001 | |||||
| Pins or screws | 14 301 (17.9%) | 6043 (16.4%) | 2208 (16.9%) | 686 (17.3%) | 220 (20.6%) | |
| Pins or screws with sideplate | 20 646 (25.8%) | 9545 (25.9%) | 3375 (25.8%) | 1043 (26.3%) | 293 (27.4%) | |
| Intramedullary rod | 18 511 (23.2%) | 8960 (24.3%) | 3266 (25.0%) | 1014 (25.5%) | 241 (22.5%) | |
| Hemiarthroplasty | 19 637 (24.6%) | 9940 (27.0%) | 3653 (27.9%) | 1083 (27.3%) | 283 (26.5%) | |
| Total hip replacement | 6798 (8.5%) | 2340 (6.4%) | 575 (4.4%) | 144 (3.6%) | 32 (3.0%) | |
| Missing | 48 (0.1%) | 20 (0.1%) | 9 (0.1%) | 1 (0.0%) | 0 (0.0%) |
ASA, American Society of Anesthesiologists; CCI, Charlson Comorbidity Index; RCRI, Revised Cardiac Risk Index.