Table 5.

Inter-observer and intra-observer agreements of experts and non-experts for the NICE classification

	Kappa value
	Average	Median	Range
Inter-observer agreement
Experts	0.86	0.86	0.76–0.93
Non-experts	0.59	0.62	0.47–0.63
Intra-observer agreement
Experts	0.82	0.83	0.68–0.90
Non-experts	0.63	0.63	0.54–0.70

Observers were experienced with > 3000 colonoscopies

Observers were medical students

NICE classification Narrow-band imaging international colorectal endoscopic classification