Critical test results for emergency department CT examinations performed at Hamilton Health Sciences*
| CT type | CT examinations with critical test results, no. (95% CI); study period | Critical test result yield, %; study period | ||||
|---|---|---|---|---|---|---|
| Before pandemic | During pandemic | p value | Before pandemic | During pandemic | p value | |
| CT examination of the head | 112 (92–135) | 82 (65–102) | 0.03 | 19.1 (112/587) | 23.0 (82/357) | 0.2 |
| CT angiogram of the head and neck | 16 (9–26) | 14 (8–23) | 0.7 | 34.0 (16/47) | 48.3 (14/29) | 0.3 |
| CT pulmonary angiogram | 88 (71–108) | 43 (31–58) | < 0.001 | 60.3 (88/146) | 56.6 (43/76) | 0.7 |
| CT examination of the abdomen and pelvis | 163 (139–190) | 183 (157–212) | 0.3 | 67.6 (163/241) | 78.2 (183/234) | 0.01 |
| Total | 379 (342–419) | 322 (288–359) | 0.03 | 37.1 (379/1021) | 46.3 (322/696) | < 0.001 |
Note: CI = confidence interval, CT = computed tomography.
* All values are presented as total counts or as a percentage of the total.