Baseline characteristics of patients undergoing inpatient surgery from 2011 to 2018 at The Ottawa Hospital, n = 98 701
| Characteristic | %* | Absolute standardized difference† | |
|---|---|---|---|
| Nunavut Inuit n = 928 | Non-Inuit n = 97 773 | ||
| Sex, female | 52.3 | 58.9 | 0.13 |
| Age at surgery, yr, mean ± SD | 51 ± 17 | 59 ± 18 | 0.43 |
| Surgery type | |||
| Orthopedic surgery | 40.0 | 30.4 | 0.20 |
| General surgery | 20.3 | 21.5 | 0.03 |
| Urology | 6.6 | 12.5 | 0.20 |
| Neurosurgery | 6.8 | 9.1 | 0.09 |
| Benign gynecology | 5.7 | 7.8 | 0.08 |
| Gynecologic oncology | 1.0 | 3.1 | 0.15 |
| Vascular surgery | 1.6 | 6.8 | 0.26 |
| Otolaryngology | 2.8 | 4.5 | 0.09 |
| Thoracic surgery | 6.4 | 3.6 | 0.13 |
| Plastic surgery | 4.0 | 1.3 | 0.17 |
| Dental surgery | 3.9 | 1.2 | 0.17 |
| Procedural urgency | |||
| Elective | 41.9 | 57.5 | 0.32 |
| Urgent‡ | 58.1 | 42.5 | 0.32 |
| Cancer | 8.9 | 13.2 | 0.14 |
| Comorbidities | |||
| Alcohol use disorder | 2.4 | 0.5 | 0.16 |
| Anemia § | 0.2 | 0.01 | |
| Arrhythmia | 1.7 | 2.5 | 0.51 |
| Blood loss anemia § | 0.1 | 0.05 | |
| Heart failure | 1.5 | 0.9 | 0.06 |
| Chronic obstructive pulmonary disease | 4.9 | 1.6 | 0.19 |
| Connective tissue disease § | 0.5 | 0.01 | |
| Cancer with metastasis | 7.0 | 5.7 | 0.06 |
| Cancer without metastasis | 14.9 | 18.2 | 0.09 |
| Coagulopathy § | 0.7 | 0.02 | |
| Depression § | 0.5 | 0.02 | |
| Diabetes with complications | 3.3 | 7.3 | 0.18 |
| Diabetes without complications | 4.2 | 6.4 | 0.10 |
| Substance use disorder § | 0.3 | 0.03 | |
| Fluid or electrolyte abnormality | 2.2 | 1.0 | 0.09 |
| Hypertension with complications § | 0.1 | 0.03 | |
| Hypertension without complications | 7.3 | 8.4 | 0.04 |
| Hypothyroidism § | 0.5 | 0.08 | |
| Liver disease § | 0.5 | 0.01 | |
| Lymphoma § | 0.6 | 0.06 | |
| Neurologic disease | 1.3 | 1.0 | 0.02 |
| Obesity § | 4.2 | 0.23 | |
| Peptic ulcer disease § | 0.1 | 0.04 | |
| Peripheral vascular disease | 0.9 | 4.6 | 0.23 |
| Paralysis | 1.1 | 0.7 | 0.04 |
| Psychosis § | 0.2 | 0.03 | |
| Pulmonary disease § | 0.1 | 0.01 | |
| Renal disease § | 1.6 | 0.12 | |
| Cardiac valve disease | 0.8 | 0.3 | 0.06 |
| Weight loss § | 0.2 | 0.06 | |
| Validated risk scores | |||
| Elixhauser score, mean ± SD | 2.0 ± 4.7 | 1.7 ± 4.2 | 0.07 |
| Laboratory-based Acute Physiology Score, mean ± SD | 12.0 ± 18.8 | 9.8 ± 17.5 | 0.12 |
| American Society of Anesthesiologists Physical Status Classification System score | |||
| 1 to 2 | 85.9 | 84.1 | 0.05 |
| 3 to 5 | 14.1 | 15.9 | 0.05 |
| Procedural Index for Mortality Risk score, mean ± SD | 0.6 ± 2.0 | 0.4 ± 1.4 | 0.11 |