Diagnostic performance of narrow-band imaging international colorectal endoscopic and Japanese narrow-band imaging expert team classification systems for colorectal cancer and precancerous lesions

Table 2 Performance characteristics of each type of the narrow-band imaging international colorectal endoscopic classification

NICE	Group1	Sensitivity, % (95%CI)	Specificity, % (95%CI)	Accuracy, % (95%CI)	PPV, % (95%CI)	NPV, % (95%CI)
Type 1	HEE	84.6 (65.5-100.0)	94.9 (93.7-96.2)	93.9 (90.8-96.9)	65.9 (55.6-76.3)	98.2 (95.9-100.0)
	LEE	82.1 (60.0-100.0)	93.8 (91.5-96.0)	92.5 (88.4-96.7)	60.4 (46.2-74.5)	97.8 (95.2-100.0)
		P = 0.637	P = 0.105	P = 0.275	P = 0.275	P = 0.376
Type 2	HEE	91.4 (88.7-94.0)	86.3 (77.8-94.7)	90.7 (89.5-91.8)	97.7 (96.4-99.0)	61.2 (56.0-66.4)
	LEE	89.8 (87.5-92.1)	84.3 (75.9-92.8)	89.1 (86.8-91.4)	97.3 (96.0-98.7)	56.6 (50.6-62.6)
		P = 0.105	P = 0.456	P = 0.043 0.1	P = 0.121	P = 0.100
Type 3	HEE	91.7 (55.8-100.0)	97.0 (92.2-100.0)	96.8 (91.5-100.0)	54.0 (-2.7-100.0)	99.7 (99.5-100.0)
	LEE	83.3 (47.5-100.0)	96.4 (92.1-100.0)	96.0 (90.7-100.0)	45.8 (0.7-91.0)	99.4 (98.2-100.0)
		P = 0.042	P = 0.487	P = 0.367	P = 0.376	P = 0.346

¹Three endoscopists in each group.

CI: Confidence interval; HEE: Highly experienced endoscopist; LEE: Less-experienced endoscopist; NPV: Negative predictive value; PPV: Positive predictive value; NICE: Narrow-band imaging international colorectal endoscopic.