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| Variables | ED visits with CT utilization | ED visits without CT utilization | P |
| (n = 23,899) | (n = 173,613) | ||
| ED cost ($) | 67.5 (39.5∼116.3) | 19.3 (7.5∼42.5) | <.0001 |
| ED length of stay (hr) | 11.3 (8.2∼15.8) | 10.7 (7.8∼15.5) | .0003 |
| Admitted to wards (%) | 4167 (17.4%) | 14,441 (8.3%) | <.0001 |
| Received emergency operations (%) | 1196 (5.0%) | 1748 (1.0%) | <.0001 |
ED, emergency department, CT, computed tomography.
