Baseline demographic and clinical characteristics of patients who underwent emergent appendectomy in Ontario, 2009–2014
| Characteristic | No. (%) of patients* | ||
|---|---|---|---|
| Total n = 50 369 | No complications n = 35 918 | Complications n = 14 451 | |
| Age, yr, mean ± SD | 39.9 ± 16.5 | 38.4 ± 15.5 | 43.5 ± 18.0 |
| Age group, yr | |||
| 18–30 | 18 288 (36.3) | 13 922 (38.8) | 4366 (30.2) |
| 31–50 | 18 865 (37.4) | 13 709 (38.2) | 5156 (35.7) |
| 51–70 | 10 681 (21.2) | 7083 (19.7) | 3598 (24.9) |
| ≥ 71 | 2535 (5.0) | 1204 (3.4) | 1331 (9.2) |
| Sex | |||
| Female | 25 313 (50.2) | 17 503 (48.7) | 7810 (54.0) |
| Male | 25 056 (49.7) | 18 415 (51.3) | 6641 (46.0) |
| Sum of all Johns Hopkins ADGs, mean ± SD | 5.9 ± 2.8 | 5.5 ± 2.6 | 6.9 ± 3.1 |
| Sum of major Johns Hopkins ADGs, mean ± SD | 1.6 ± 0.8 | 1.4 ± 0.7 | 1.9 ± 1.0 |
| Neighbourhood income quintile | |||
| 1 (lowest) | 9489 (18.8) | 6550 (18.2) | 2939 (20.3) |
| 2 | 9727 (19.3) | 6928 (19.3) | 2799 (19.4) |
| 3 | 9981 (19.8) | 7122 (19.8) | 2859 (19.8) |
| 4 | 10 692 (21.2) | 7644 (21.3) | 3048 (21.1) |
| 5 (highest) | 10 243 (20.3) | 7509 (20.9) | 2734 (18.9) |
| Missing | 237 (0.5) | 165 (0.4) | 72 (0.5) |
| Residence at time of appendectomy | |||
| Urban | 44 680 (88.7) | 32 148 (89.5) | 12 532 (86.7) |
| Rural | 5668 (11.2) | 3755 (10.4) | 1913 (13.2) |
| Missing | 21 (0.04) | 15 (0.0) | 6 (0.04) |
| Perforation status | |||
| Nonperforated | 33 416 (66.3) | 24 988 (69.6) | 8428 (58.3) |
| Perforated | 16 953 (33.6) | 10 930 (30.4) | 6023 (41.7) |
| Time from triage to operating room, h, mean ± SD | 13.6 ± 11.8 | 12.7 ± 9.2 | 18.5 ± 100.8 |
| Time from triage to operating room, h | |||
| < 6 | 7993 (15.9) | 5806 (16.2) | 2187 (15.1) |
| 6–12 | 19 492 (38.7) | 14 198 (39.5) | 5294 (36.6) |
| > 12 | 22 122 (43.9) | 15 500 (43.2) | 6622 (45.8) |
| Missing | 762 (1.5) | 414 (1.2) | 348 (2.4) |
| Time of appendectomy | |||
| 8 am–5 pm | 15 638 (31.0) | 10 914 (30.4) | 4724 (32.7) |
| 5 pm–12 am | 28 255 (56.1) | 20 361 (56.7) | 7894 (54.6) |
| 12 am–8 am | 6476 (12.8) | 4643 (12.9) | 1833 (12.7) |
| Surgical technique | |||
| Laparoscopic | 40 991 (81.4) | 30 310 (84.4) | 10 681 (73.9) |
| Open | 9378 (18.6) | 5608 (15.6) | 3770 (26.1) |
ADG = Aggregated Diagnosis Group; SD = standard deviation.
↵* Except where noted otherwise.