Table 3.

Diagnostic performances for histology predictions by using digital chromoendoscopy

	Diagnostic performances
	Polyps (n)	Sensitivity (95 % CI)	Specificity (95 % CI)	PPV (95 % CI)	NPV (95 % CI)
All distal polyps
Overall prediction	121	93.3 % (82.7–97.8)	88.7 % (77.5–95)	88.7 % (77.5–95)	93.2 % (82.7–97.8)
HC prediction	107	98.1 % (88.6–99.9)	94.4 % (83.7–98.6)	94.5 % (83.9–98.6)	98.1 % (88.4–99.9)
Polyps in the rectosigmoid only
Overall prediction	79	90.3 % (73.1–97.5)	87.5 % (74.1–94.8)	82.4 % (64.8–92.6)	93.3 % (80.1–98.3)
HC prediction	72	96.4 % (79.8–99.8)	95.5 % (83.3–99.2)	93.1 % (75.8–98.8)	97.7 % (86.2–99.9)

CI Confidence Interval, PPV Positive Predictive Value, NPV Negative Predictive Value, HC High Confidence