Web-based system for training and dissemination of a magnification chromoendoscopy classification

Table 1 Reproducibility for the classification in groups (I vs II vs III) and in subgroups (I vs IIE vs IIF vs III) according to number of times observers (A, B and C) classified the films of magnification chromoendoscopy

Number of classification (nth)	Inter-observer agreement (95% CI)
	Proportion of agreement	Weighted kappa
Classification in groups
1st observation	0.60 (0.36-0.81)	0.52 (0.26-0.75)
2nd observation	0.85 (0.62-0.97)	0.73 (0.53-0.87)
3rd observation	0.85 (0.62-0.97)	0.71 (0.51-0.86)
4th observation	0.95 (0.75-1.00)	0.97 (0.94-0.99)
5th observation	0.80 (0.56-0.94)	0.71 (0.50-0.86)
6th observation	0.90 (0.68-0.99)	0.94 (0.89-0.98)
Classification in subgroups
1st observation	0.45 (0.23-0.69)	0.49 (0.23-0.73)
2nd observation	0.55 (0.31-0.77)	0.69 (0.48-0.85)
3rd observation	0.45 (0.23-0.69)	0.66 (0.42-0.83)
4th observation	0.70 (0.46-0.88)	0.90 (0.81-0.96)
5th observation	0.60 (0.36-0.81)	0.66 (0.43-0.83)
6th observation	0.75 (0.51-0.91)	0.92 (0.84-0.96)