Table 5.

Interobserver analysis for the Schatzker classification.

Obs 1 x Obs 2	Observed agreement	Kappa coefficient	Kappa SE	p-value
MS x R3_1	58.0	0.465	0.067	< 0.0001
MS x R3_2	52.0	0.411	0.062	< 0.0001
MS x R2_1	48.0	0.344	0.066	< 0.0001
MS x R2_2	50.0	0.340	0.068	< 0.0001
MS x R1_1	44.0	0.278	0.068	< 0.0001
MS x R1_2	54.0	0.411	0.067	< 0.0001
R3_1 x R3_2	52.0	0.415	0.063	< 0.0001
R3_1 x R2_1	54.0	0.426	0.067	< 0.0001
R3_1 x R2_2	64.0	0.535	0.070	< 0.0001
R3_1 x R1_1	54.0	0.414	0.070	< 0.0001
R3_1 x R1_2	56.0	0.446	0.068	< 0.0001
R3_2 x R2_1	54.0	0.447	0.060	< 0.0001
R3_2 x R2_2	52.0	0.419	0.059	< 0.0001
R3_2 x R1_1	54.0	0.440	0.062	< 0.0001
R3_2 x R1_2	40.0	0.283	0.059	< 0.0001
R2_1 x R2_2	54.0	0.413	0.068	< 0.0001
R2_1 x R1_1	50.0	0.368	0.068	< 0.0001
R2_1 x R1_2	44.0	0.297	0.068	< 0.0001
R2_2 x R1_1	60.0	0.473	0.073	< 0.0001
R2_2 x R1_2	62.0	0.504	0.071	< 0.0001
R1_1 x R1_2	66.0	0.564	0.070	< 0.0001

Obs: observer; MS: medical specialists, R3: third-year resident, R2: second-year resident; R1: first-year resident, SE: standard error.

Source: SOT-HMMC, 2006.