Table 3.
Sensitivity and specificity of the 11 computed tomography parameters for predicting viral or bacterial acute colitis prevalence
| CT parameter |
Viral
|
Bacterial
|
||||||
|
Se (%)
|
Sp (%)
|
PPV (%)
|
NPV (%)
|
Se (%)
|
Sp (%)
|
PPV (%)
|
NPV (%)
|
|
| Wall thickening1 | 40.0 | 10.3 | 8.0 | 46.7 | 89.7 | 60.0 | 92.0 | 53.3 |
| Submucosal edema | 30.0 | 7.4 | 6.0 | 34.9 | 92.6 | 70.0 | 94.0 | 65.1 |
| Mucosal enhancement | 27.5 | 11.3 | 5.7 | 44.2 | 88.7 | 72.5 | 94.3 | 55.8 |
| Serosal involvement | 5.0 | 53.9 | 2.1 | 74.3 | 46.1 | 95.0 | 97.9 | 25.7 |
| Empty colon sign1 | 12.5 | 51.0 | 4.8 | 74.8 | 49.0 | 87.5 | 95.2 | 25.2 |
| Small bowel involvement | 30.0 | 60.3 | 12.9 | 81.5 | 39.7 | 70.0 | 87.1 | 18.5 |
| Comb sign | 2.5 | 85.3 | 3.2 | 81.7 | 14.7 | 97.5 | 96.8 | 18.3 |
| Continuous distribution | 25.0 | 15.2 | 5.5 | 50.8 | 84.8 | 75.0 | 94.5 | 49.2 |
| Accordion sign | 2.5 | 82.8 | 2.8 | 81.3 | 17.2 | 97.5 | 97.2 | 18.8 |
| Mucosal thickening | 5.0 | 33.3 | 1.4 | 64.2 | 66.7 | 95.0 | 98.6 | 35.8 |
| Lymph node enlargement | 7.5 | 79.4 | 6.7 | 81.4 | 20.6 | 92.5 | 93.3 | 18.6 |
1
Recategorized to binary values of normal vs non-normal.
CT: Computed tomography; Se: Sensitivity; Sp: Specificity; PPV: Positive predictive value; NPV: Negative predictive value.