Table 4.

Test performance: summary findings

NBI colonoscopy vs histology (reference)	Estimate (%)	95% CI
Adenoma (yes/no)*
Sensitivity	83.4	79.6% to 86.9%
Specificity	74.8	67.6% to 81.1%
PPV	89.2	85.9% to 92.4%
NPV	64.5	57.3% to 71.8%
Surveillance (yes/no)*
Sensitivity	73.0	66.5% to 79.9%
Specificity	75.6	70.9% to 80.1%
PPV	59.2	52.3% to 66.0%
NPV	85.2	81.0% to 89.1%
Exact match	67.9	64.1% to 71.9%
Conservative match	87.6	84.6% to 90.4%

*For explanation see table 3.

NBI, narrow band imaging; NPV, negative predictive value; PPV, positive predictive value.