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True-and false-positive frequency, positive predictive value (with 95%CI), for NPCT scan, according to specific CT diagnosis.
| CT diagnoses | Total number | True positive | False positive | Positive predictive value (95%CI) |
| Colonic tumor | 10 | 6 | 4 | 60% (29-86) |
| Inflammatory bowel | 9 | 2 | 7 | 22% (4-56) |
| disease | ||||
| Colonic polyp | 1 | 1 | 0 | 100% (5-100) |
| Total number | 20 | 9 | 11 | 45% (25-67) |
