| Before PSM | After PSM | |||
---|---|---|---|---|---|
 | COVID-19 era (n = 3770) | Pre-COVID-19 (n = 4960) | p-value | Pre-COVID-19 (n = 3770) | p-value |
Result of ED visit |  |  |  < 0.001 |  |  < 0.001 |
 Admission to ward | 2261 (60.0) | 2914 (58.8) |  | 2167 (57.5) |  |
 Emergency operation | 476 (12.6) | 581 (11.7) |  | 467 (12.4) |  |
 Admission to ICU | 813 (21.6) | 971 (19.6) |  | 803 (21.3) |  |
 Transfer to other hospital | 164 (4.4) | 410 (8.3) |  | 282 (7.5) |  |
 Death in ER | 56 (1.5) | 84 (1.7) |  | 51 (1.4) |  |
Time from injury to ED visit (minutes) | 256.8 ± 338.3 | 230.6 ± 317.7 |  < 0.001 | 229.9 ± 313.9 |  < 0.001 |
ER stay (minutes) | 280.5 ± 203.9 | 278.2 ± 223.9 | 0.614 | 278.4 ± 227.1 | 0.676 |
Time from injury to operation (minutes) | 359.9 ± 254.9 | 366.5 ± 264.9 | 0.680 | 358.8 ± 258.5 | 0.947 |
Time from ED visit to operation (minutes) | 203.1 ± 202.2 | 201.3 ± 197.0 | 0.883 | 193.9 ± 193.5 | 0.477 |
Hospital LOS (day) | 15.7 ± 22.9 | 17.3 ± 28.0 | 0.007 | 18.6 ± 30.3 |  < 0.001 |
ICU LOS (days) | 6.8 ± 11.4 | 7.3 ± 9.3 | 0.172 | 7.7 ± 9.7 | 0.031 |
Duration of mechanical ventilation (days) | 4.2 ± 7.2 | 6.6 ± 10.1 |  < 0.001 | 6.9 ± 10.5 |  < 0.001 |
Transfusion within 24Â h (units) | Â | Â | Â | Â | Â |
 Red blood cell | 0.6 ± 2.6 | 0.6 ± 3.0 | 0.930 | 0.7 ± 3.1 | 0.235 |
 Fresh frozen plasma | 0.5 ± 2.4 | 0.5 ± 2.5 | 0.701 | 0.6 ± 2.6 | 0.488 |
 Platelet concentration | 0.1 ± 1.0 | 0.1 ± 0.9 | 0.219 | 0.1 ± 0.9 | 0.632 |
Mortality | 209 (5.5) | 252 (5.1) | 0.363 | 196 (5.2) | 0.540 |