Table 2.
Outcomes of CT and US cohorts
| Outcome | CT cohort (N = 79) | US cohort (N = 197) | |
|---|---|---|---|
| Sensitivity | |||
| %, ± 95% CI | 100% (94.2-100%) | 68.4% (60.9-75.0%) | |
| PPV | |||
| %, ± 95% CI | 100% (94.2-100%) | 94.5% (88.6-97.6%) | |
| Neg appendectomy (after positive imaging) | 0% (0 of 78) | 5.5% (7 of 128) | p = 0.049 |
| Times (min) | |||
| Admission to imaging ordered | |||
| Mean (95% CI) | 142.6 (122.6-162.6) | 158.4 (139.3-177.5) | p = 0.870 |
| Median (IQR) | 130.0 (74.0-198.0) | 114.0 (74.5-193.5) | |
| Imaging ordered to complete | |||
| Mean (95% CI) | 194.2 (177.9-210.5) | 38.2 (31.1-45.3) | p < 0.001 |
| Median (IQR) | 184.0 (147.0-228.0) | 20.0 (7.0-49.0) | |
| Imaging complete to ED disposition | |||
| Mean (95% CI) | 222.7 (187.5-257.8) | 251.7 (221.2-282.3) | p = 0.891 |
| Median (IQR) | 192 (141.0-266.0) | 193.0 (101.0-312.5) | |
| Admission to ED disposition | |||
| Mean (95% CI) | 559.5 (518.6-600.4) | 448.3 (410.9-485.7) | p < 0.001 |
| Median (IQR) | 533.0 (450.0-632.0) | 387.0 (259.0-571.5) | |
*Means were compared with two-tailed t-test. Negative appendectomy rate was compared with two-tailed Fisher's exact test.