Optical diagnosis by near-focus versus normal-focus narrow band imaging colonoscopy in colorectal polyps based on combined NICE and WASP classification: a randomized controlled trial.

The accuracy of the NICE classification in the optical diagnosis of neoplastic polyps by the endoscopists with higher kappa values was 79% in group A, and was greater than the 71% accuracy in group B, however the difference was not significant ( p =0.25) ( Supplementary Table 1 ), whereas the accuracy of optical diagnosis using the NICE classification for neoplastic polyps by the endoscopists with lower kappa values was 55% in group A, which was lower than the 60% accuracy in group B, but the difference failed to reach statistical significance ( p =0.57) ( Supplementary Table 2 ).

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