Table 3. Per-lesion accuracy of radiologists and gastroenterologists in detecting cancers or adenomas on CTCa.

Performance by lesion	Cancer or adenoma ≥6 mm		Cancer or adenoma ≥10 mm
	GI	RAD	GI	RAD
True-positive results, no.	441	394	213	205
False-negative results, no.	97	144	25	33
False-positive results, no.	95	122	14	24
C0 (CTC image not available)	20	20	10	10
Sensitivity (95% CI)	0.82 (0.78–0.85)	0.73 (0.69–0.77)	0.89 (0.85–0.93)	0.86 (0.81–0.90)
P value	0.000002		0.10
Positive predictive value (95% CI)	0.82 (0.79–0.85)	0.76 (0.72–0.80)	0.94 (0.90–0.97)	0.90 (0.85–0.93)
P value	0.001		0.025

CI, confidence interval; CTC, computed tomographic colonography; GI, gastroenterologist; RAD, radiologist.

^aValues of RAD for detection of lesions on CTC were averaged among radiologists, and values of GI were averaged among gastroenterologists.