Patients' basic demographic factors
| CT used (33 336) | CT not used (260 090) | p Value* | |||
|---|---|---|---|---|---|
| Age | 60.5 | ±18.34 | 53.7 | ±19.67 | <0.001 |
| Sex | |||||
| Male | 18 101 | 54.3% | 129 005 | 49.6% | <0.001 |
| Female | 15 235 | 45.7% | 131 085 | 50.4% | |
| Triage | |||||
| Urgent | 10 428 | 31.3% | 42 853 | 16.5% | <0.001 |
| Non-urgent | 22 908 | 68.7% | 217 237 | 83.5% | |
| Time of arrival | |||||
| 8:00–16:00 | 15 172 | 45.5% | 103 630 | 39.8% | <0.001 |
| 16:00–00:00 | 13 146 | 39.4% | 102 392 | 39.4% | |
| 00:00–8:00 | 5018 | 15.1% | 54 068 | 20.8% | |
| Physician | |||||
| Visit staff | 21 051 | 63.1% | 162 100 | 62.3% | 0.003 |
| Resident | 12 285 | 36.9% | 97 990 | 37.7% | |
| Hospital | |||||
| Centre | 21 523 | 64.6% | 147 499 | 56.7% | <0.001 |
| Regional | 11 813 | 35.4% | 112 591 | 43.3% | |
| Disposition | |||||
| Discharge from ED | 8246 | 24.7% | 146 539 | 56.30% | <0.001 |
| Discharge from observation room | 6607 | 19.8% | 47 831 | 18.40% | |
| Admission to general ward | 15 682 | 47.0% | 58 988 | 22.70% | |
| Admission to ICU | 2557 | 7.7% | 5175 | 2.00% | |
| ED mortality | 244 | 0.7% | 1557 | 0.60% | |
| Diagnostic category | |||||
| Nervous | 11 724 | 35.2% | 25 208 | 9.7% | <0.001 |
| Gastrointestinal | 6671 | 20.0% | 61 229 | 23.5% | |
| Genitourinary | 2213 | 6.6% | 25 795 | 9.9% | |
| Pulmonary | 1911 | 5.7% | 44 782 | 17.2% | |
| Neoplasms | 1714 | 5.1% | 10 501 | 4.0% | |
| Cardiovascular | 1456 | 4.4% | 17 914 | 6.9% | |
| Others | 7647 | 22.9% | 74 661 | 28.7% | |
| ED LOS (h) | 16.6 | ±27.13 | 13.0 | ±27.28 | <0.001 |
| Hospital LOS (day) | 12.7 | 14.44 | 12.5 | 12.99 | <0.001 |
*Continuous variables (age, ED LOS and hospital LOS) were analysed by Student's t test, and all other category variables were analysed by χ2 test. A p value <0.05 was regarded as statistically significant.
ED, emergency department; ICU, intensive care unit; LOS, length of stay.