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True-and false-positive frequency, positive predictive value for NPCT scan, including patients with delayed colonoscopy.
| CT diagnoses | Total number | True positive | False positive | Positive predictive value (95%CI) |
| Colonic tumor | 11 | 7 | 4 | 63% (3-487) |
| Inflammatory bowel | 13 | 2 | 11 | 15% (3-42) |
| disease | ||||
| Colonic polyp | 1 | 0 | 100% (5-100) | |
| Total number | 25 | 10 | 15 | 40% (2-260) |
