Test characteristics of ACBE, CTC, and colonoscopy for detecting large colonic polyps*
| Test | Lesion size | Sensitivity (95% CI) | Specificity (CI) | +LR | −LR |
|---|---|---|---|---|---|
| *ACBE = air contrast barium enema; CTC = computed tomographic colonography. Diagnostic terms defined in glossary; LRs calculated from data in article. | |||||
| ACBE | ⩾10 mm | 48% (35 to 61) | 90% (87 to 92) | 4.80 | 0.58 |
| 6–9 mm | 35% (27 to 45) | Not reported | Not reported | Not reported | |
| ⩾6 mm | 41% (33 to 49) | 82% (78 to 85) | 2.28 | 0.72 | |
| CTC | ⩾10 mm | 59% (45 to 71) | 96% (94 to 98) | 14.75 | 0.43 |
| 6–9 mm | 51% (41 to 60) | Not reported | Not reported | Not reported | |
| ⩾6 mm | 55% (47 to 63) | 89% (86 to 92) | 5.00 | 0.51 | |
| Colonoscopy | ⩾10 mm | 98% (91 to 100) | 99.6% (99 to 100) | 245 | 0.02 |
| 6–9 mm | 99% (95 to 100) | Not reported | Not reported | Not reported | |
| ⩾6 mm | 99% (95 to 100) | 99.6% (98 to 100) | 248 | 0.01 | |