Table 3. Comparison of diagnostic efficacy between the two methods.

Methods	Diagnostic efficacy
	Accuracy	Sensitivity	Specificity	Positive predictive value	Negative predictive value
NBI	87.05 (195/224)	89.07 (163/183)	78.05 (32/41)	94.77 (163/172)	61.54 (32/52)
Endoscopic ultrasonography	57.14 (128/224)	60.11 (110/183)	43.90 (18/41)	82.71 (110/133)	19.78 (18/91)
χ2	49.810	40.494	10.045	11.617	25.375
P	<0.001	<0.001	0.002	0.001	<0.001

Enumeration data were represented as the rate (%) or constituent ratio. NBI, narrow-band imaging.