Table 2. Sensitivity (Sn), Specificity (Sp), Positive Predictive Value (PPV) and Negative Predictive Value (NPV) in the assessment of high grade dysplasia vs. no dysplasia with white-light endoscopy and optical magnification (WLE-z), narrow-band imaging and optical magnification (NBI-z) and a combination of both (95 % confidence interval).
| Sn, % | Sp, % | PPV, % | NPV, % | |
| WLE-z | 48.4 (45.3 – 50.6) | 92.2 (90.5 – 93.4) | 45.6 (42.3 – 47.6) | 93.5 (91.6 – 94.3) |
| NBI-z | 89.1 (87.3 – 90.6) | 89.3 (87.3 – 90.6) | 56.5 (53.4 – 58.6) | 98.3 (97.2 – 98.7) |
| Combination | 93.4 (91.6 – 94.3) | 90.3 (88.4 – 91.5) | 61.7 (58.4 – 63.5) | 99.2 (98.4 – 99.5) |