Biopsy forceps are useful for measuring esophageal varices in vitro

Table 2 Measurement accuracy of 52 endoscopists for each measurement condition

	Visual method	Biopsy forceps	P value
All varices
Accuracy (exact)	13.81%	20.28%	0.004
Actual size ≤ 5 mm
Accuracy (exact)	22.12%	34.62%	0.005
Actual size > 5 mm
Accuracy (exact)	9.07%	12.09%	0.185
Correct classification
≤ 5 mm (category A)	84.62%	87.98%	0.996
> 5 mm (category B)	64.56%	78.85%	< 0.0001