Patients’ characteristics
| Patients (n=6395) | |
| Age, year, mean (SD) | 42.6 (16.9) |
| Male, n (%) | 4592 (71.8) |
| Blood alcohol level, mg/dL, mean (SD) | 225.4 (87.2) |
| Type of day when the patient visited the hospital | |
| Weekdays, n (%) | 3125 (48.9) |
| Days prior to day off, n (%) | 1220 (19.1) |
| Day off, n (%) | 2050 (32.1) |
| Season in which the patient visited the hospital | |
| Spring, n (%) | 1562 (24.4) |
| Summer, n (%) | 1558 (24.4) |
| Fall, n (%) | 1617 (25.3) |
| Winter, n (%) | 1658 (25.9) |
| The occurrence of earthquake when the patient visited the hospital | |
| A whole day, n (%) | 657 (10.3) |
| Daytime earthquake, n (%) | 197 (3.1) |
| Night-time earthquake, n (%) | 188 (2.94) |