Characteristics of COVID-19 patients
| Variable | Symptomatic status at time of surgery | |
| Asymptomatic (n=58) | Symptomatic (n=47) | |
| Baseline characteristics | ||
| Age (years) | 57.5 (36.5–74.8) | 66.0 (52.5–72.5) |
| Sex (female) | 30 (52%) | 25 (53%) |
| BMI* (kg/m2) | 27.4±7.4 | 30.8±6.0 |
| Diabetes | 14 (24%) | 15 (32%) |
| Hypertension | 11 (19%) | 6 (13%) |
| White blood cell count† (×109 /L) | 8.8 (6.9–13.0) | 9.5 (6.6–12.5) |
| Hemoglobin† (g/L) | 117.0 (104.0–133.0) | 101.0 (81.0–122.5) |
| Creatinine‡ (µmol/L) | 77.0 (56.3–96.0) | 83.0 (56.0–131.5) |
| COVID characteristics | ||
| Days from first positive COVID test to surgery | 4.0 (1.0–9.8) | 10.0 (3.0–22.5) |
| Pulmonary infiltrates | 12 (21%) | 28 (60%) |
| Steroid | 14 (24%) | 20 (43%) |
| Antibiotic | 16 (28%) | 33 (70%) |
| Preoperative respiratory support | ||
| No oxygen | 45 (78%) | 17 (36%) |
| Oxygen only | 4 (7%) | 7 (15%) |
| Non-invasive mechanical ventilation | 0 (0%) | 1 (2%) |
| Invasive ventilation | 9 (16%) | 22 (47%) |
| Surgical characteristics | ||
| Preoperative location | ||
| Home | 15 (26%) | 7 (15%) |
| Emergency department | 14 (24%) | 7 (15%) |
| Ward | 23 (40%) | 10 (21%) |
| Intensive care unit | 6 (10%) | 23 (49%) |
| Urgent surgery (≤24 hours) | 24 (41%) | 22 (47%) |
| Major surgery | 21 (36%) | 17 (36%) |
| Duration of surgery (minutes) | 60.0 [40.3–97.3) | 47.0 [27.5–98.5) |
Categorical variables are presented as frequency (proportion).
Continuous variables are presented as mean±SD or as median (first quartile–third quartile).
*Missing value for 28 and 17 patients, respectively.
†One missing value in the asymptomatic group.
‡Three missing values in the asymptomatic group.