Table 1.
Characteristics of unilateral and bilateral hip fracture patients and results of the univariable Cox regression analysis
| Study population N (%) | Unilateral hip fracture N (%) | Bilateral hip fracture N (%) | HR (CI) | p value | |
|---|---|---|---|---|---|
| Median (IQR) follow-up in days | 1,229 (100) | 1,060 (86.2) | 169 (13.8) | ||
| 543 (873) | 536 (886) | 563 (810) | 0.81* | ||
| Gender | |||||
| Female | 891 (72.5) | 768 (72.5) | 123 (72.8) | 1.15 (0.82–1.62) | 0.41 |
| Male | 338 (27.5) | 292 (27.5) | 46 (27.2) | ||
| Age, mean (SD) | 81.7 (9.5) | 81.7 (9.4) | 82.0 (9.9) | 0.74# | |
| Age HR per year | 1.02 (1.01–1.04) | 0.011 | |||
| Age HR per decade | 1.25 (1.05–1.48) | 0.011 | |||
| ASA classification | |||||
| I–II | 849 (69.1) | 727 (68.6) | 122 (72.2) | 1.07 (0.76–1.49) | 0.71 |
| III–IV | 380 (30.9) | 333 (31.4) | 47 (27.8) | ||
| Fracture type | |||||
| Neck of femur | 704 (57) | 617 (58) | 87 (51.5) | ||
| (Inter) trochanteric | 485 (39) | 412 (39) | 73 (43.2) | ||
| Subtrochanteric | 40 (3) | 31 (3) | 9 (5.3) | 0.11 | |
| Anaesthesia | |||||
| Spinal | 1,129 (92) | 1,032 (92) | 97 (91) | ||
| General | 83 (7) | 75 (7) | 8 (7) | 0.94 | |
Female gender and ASA I–II are reference categories
HR Hazard ratio, CI confidence interval, IQR interquartile range, ASA American society of anesthesiologists physical status classification
* Mann–Whitney test
# t test