Table 2 Sensitivity of magnetic resonance colonography on a lesion basis compared with the gold standard of colonoscopy.

	<5 mm (group a)	5–10 mm (group b)	>10 mm (group c)	>5 mm (groups b+c)	All
No (C)	153	59	23	82	235
No (MRC)	16	34	17	51	67
Sensitivity	10.5	57.6	73.9	62.2	28.5
False positive findings of MRC	14	8	0	8	22

C, Colonoscopy; MRC, magnetic resonance colonography.