Patients’ characteristics of the baseline population and by age group
| Patient characteristics | Baseline population Number (%) (n=11 376)* | Youngest Age 17–64 Number (%) (n=2514)† | Medium Age 65–79 Number (%) (n=3795)† | Oldest Age 80+ Number (%) (n=4892)† |
|---|---|---|---|---|
| Median age (years) (IQR) | 78.0 (66–85) | 54.0 (43–60) | 74.0 (69–77) | 86.0 (83–90) |
| Sex‡ | ||||
| Female | 5081/11 373 (44.7) | 952/2514 (37.9) | 1526/3795 (40.2) | 2531/4892 (51.7) |
| Male | 6292/11 373 (55.3) | 1560/2514 (62.1) | 2269/3795 (59.8) | 2361/4892 (48.3) |
| Type of admission‡ | ||||
| Elective | 1854/11 173 (16.6) | 382/2467 (15.5) | 807/3717 (21.7) | 637/4822 (13.2) |
| Emergency | 9319/11 173 (83.4) | 2084/2467 (84.5) | 2909/3717 (78.3) | 4185/4822 (86.8) |
| Malignancy‡ | ||||
| Malignancy not present | 5255/7755 (67.8) | 1220/1698 (71.8) | 1588/2566 (61.9) | 2301/3264 (70.5) |
| Malignancy present | 2287/7755 (29.5) | 455/1612 (28.2) | 938/2493 (37.6) | 882/3296 (26.8) |
| Malignancy unknown | 213/7755 (2.8) | 42/1698 (2.4) | 50/2566 (1.9) | 86/3264 (2.6) |
| ASA class‡ | ||||
| 1 | 262 (2.4) | 223 (8.9) | 341 (0.9) | 147 (0.3) |
| 2 | 886 (8.1) | 219 (8.7) | 319 (8.4) | 264 (5.4) |
| 3 | 3644 (33.4) | 458 (18.2) | 1203 (31.7) | 1722 (35.2) |
| 4 | 4889 (44.9) | 978 (38.9) | 1730 (45.6) | 2284 (46.7) |
| 5 | 1218 (11.2) | 561 (22.3) | 501 (13.20 | 592 (12.1) |
| Comorbidity | ||||
| Comorbidity present | 9687/10 768 90.0 | 1774/2435 72.9 | 3427/3740 91.6 | 4801/4866 98.7 |
| Length of hospital stay—median days (IQR)‡ | 8 (3–17) | 8 (3–20) | 11 (5–23) | 9 (4–19) |
| Length of time from operation to death median days (IQR) | 7 (2–16) | 6 (1–14) | 8 (2–18) | 7 (2–15) |
| Surgical specialty§ | ||||
| General | 4496/11 376 (39.5) | 965/2514 (38.4) | 1662/3795 (43.8) | 1869/4892 (38.2) |
| Neurosurgery | 1484/11 376 (13.0) | 787/2514 (31.3) | 501/3795 (13.2) | 196/4892 (4.0) |
| Orthopaedics | 2282/11 376 (20.0) | 131/2514 (5.2) | 429/3795 (11.3) | 1722/4892 (35.2) |
| Cardiothoracic | 699/11 376 (6.1) | 214/2514 (8.5) | 338/3795 (8.9) | 147/4892 (3.0) |
*Baseline population (includes 175 patients not categorised by age).
†Patients categorised by age.
‡Missing items (denominator variation) applicable to the baseline population: sex=3, type of admission=203, malignancy=3621, ASA=477, length of stay=3414.
§Smaller specialties not listed.
ASA, American Society of Anaesthesiologists.