Table 1.
CT scan ordering rates by scan subtype and experimental group in the pre- and post-intervention periods
| Intervention condition | Control condition | |||||||
|---|---|---|---|---|---|---|---|---|
| Pre | Post | t | p | Pre | Post | t | p | |
| N ordered per 100 patients seen | m (SD) | m (SD) | m (SD) | m (SD) | ||||
| All CTs | 35.7 (10.0) | 40.3 (11.8) | 4.13 | < 0.001 | 33.9 (9.2) | 38.9 (11.9) | 3.94 | 0.001 |
| Abdominal/pelvic CT | 10.6 (2.9) | 10.8 (3.3) | 0.56 | 0.58 | 9.3 (2.7) | 9.5 (3.0) | 0.82 | 0.42 |
| Head CT | 9.4 (3.2) | 10.9 (3.6) | 2.22 | 0.04 | 9.7 (2.6) | 10.5 (3.0) | 1.78 | 0.09 |
| Spine CT | 3.5 (1.9) | 3.5 (1.5) | -0.02 | 0.99 | 3.4 (1.4) | 3.5 (1.5) | 0.67 | 0.51 |
| Pulmonary embolism CT | 2.5 (1.1) | 2.6 (1.3) | 0.31 | 0.76 | 2.3 (1.0) | 2.5 (1.1) | 1.52 | 0.14 |