Table 4. Interobserver agreement in the evaluation of the study images.
| Randomization | Kappa value with 95 % confidence intervals for the first evaluation (WLI only) | Kappa value with 95 % confidence intervals for the second evaluation (VC-aided) |
| WLI | 0.395 [0.382 – 0.415]1 | 0.524 [0.477 – 0.565] |
| FICE 1 | 0.317 [0.267 – 0.384] | 0.097 [0.040 – 0.151] |
| FICE 2 | 0.150 [0.122 – 0.195] | 0.092 [0.086 – 0.119] |
| FICE 3 | 0.344 [0.329 – 0.383] | 0.235 [0.191 – 0.267] |
| Blue Mode | 0.205 [0.158 – 0.272] | 0.302 [0.280 – 0.380] |
WLI, white light endoscopic imaging; VC, virtual chromoendoscopy
1
For all 15 evaluators, for the initial WLI reading, the kappa value was 0.306 [0.293 – 0.321]