Table 1.
Baseline characteristics before propensity score matching.
| Variable | On-Hours | p-Value | Off-Hours | p-Value | |||
|---|---|---|---|---|---|---|---|
| COVID-19 (−) (n = 6236) |
COVID-19 (+) (n = 877) |
COVID-19 (−) (n = 3817) |
COVID-19 (+) (n = 418) |
||||
| Male gender | 4204 (67.6) | 666 (76.2) | 0.001 | 2562 (67.3) | 305 (73.7) | 0.01 | |
| Age (years) | 65.2 (12.0) | 65.4 (11.5) | 0.7 | 64.7 (12.2) | 64.9 (13.1) | 0.8 | |
| Diabetes mellitus | 1046 (16.8) | 137 (15.6) | 0.4 | 701 (18.4) | 89 (21.3) | 0.2 | |
| Previous stroke | 201 (3.2) | 22 (2.5) | 0.3 | 116 (3.0) | 21 (5.0) | 0.04 | |
| Previous MI | 804 (12.9) | 87 (9.9) | 0.02 | 526 (13.8) | 53 (12.7) | 0.6 | |
| Previous CABG | 121 (1.9) | 11 (1.3) | 0.2 | 60 (1.6) | 7 (1.7) | 1.0 | |
| Previous PCI | 789 (12.7) | 80 (9.1) | 0.003 | 511 (13.4) | 62 (14.8) | 0.5 | |
| Smoking | 2051 (32.9) | 217 (24.7) | 0.001 | 1308 (34.3) | 128 (30.6) | 0.2 | |
| Arterial hypertension | 3647 (58.5) | 410 (46.8) | 0.001 | 2256 (59.1) | 238 (56.9) | 0.4 | |
| Chronic kidney disease | 231 (3.7) | 27 (3.1) | 0.4 | 129 (3.4) | 19 (4.5) | 0.3 | |
| Chronic obstructive pulmonary disease | 159 (2.5) | 29 (3.3) | 0.2 | 116 (3.0) | 15 (3.6) | 0.6 | |
| Killip-Kimball Class | |||||||
| I | 5297 (85) | 737 (84) | 0.001 | 3160 (82.5) | 352 (84.2) | 0.008 | |
| II | 601 (9.6) | 82 (9.4) | 0.001 | 388 (10.2) | 31 (7.4) | 0.008 | |
| III | 135 (2.2) | 26 (3.0) | 0.001 | 132 (3.5) | 17 (4.1) | 0.008 | |
| IV | 203 (3.3) | 32 (3.6) | 0.001 | 140 (3.7) | 18 (4.3) | 0.008 | |
| Cardiac arrest at admission | 244 (3.9) | 180 (20.5) | 0.001 | 151 (4.0) | 20 (4.8) | 0.5 | |
Data are presented as number (percentage) or mean and standard deviation. CABG—coronary artery bypass grafting; MI—myocardial infarction; PCI—percutaneous coronary intervention.