Table 3.

Diagnostic accuracy and error range of the estimation of colon polyp size according to the actual polyp size

	Visual estimation	Forceps estimation	P value
Diagnostic accuracy
≤ 5 mm	0.834	0.929	< 0.001
6-9 mm	0.508	0.692	< 0.001
≥ 10 mm	0.403	0.469	0.018
Error range (mm)
≤ 5 mm	0.90 ± 0.27	0.70 ± 0.17	< 0.001
6-9 mm	1.85 ± 0.82	1.30 ± 0.59	< 0.001
≥ 10 mm	2.71 ± 0.76	2.40 ± 0.67	< 0.001