Measurement system that improves the accuracy of polyp size determined at colonoscopy

Table 3 Influence of tumor size on measurement accuracy

Polyp size	Method	Rate of accurate estimation	P
			CE	DGBF
< 1 cm	CE	20.6% (28/134)	-	-
	DGBF	61.2% (82/134)	< 0.001	-
	ELMS	75.4% (101/134)	< 0.001	0.001
1-2 cm	CE	14.0% (6/43)
	DGBF	48.8 % (21/43)	< 0.001
	ELMS	74.4% (32/43)	< 0.001	0.003
> 2 cm	CE	0.0% (0/15)
	DGBF	40.0% (6/15)	0.008
	ELMS	80.0% (12/15)	0.046	0.212

CE: Clinicians’ evaluation; DGBF: Disposable graduated biopsy forceps; ELMS: Endoscopic lesion measurement system.