2. Interrater Reliability
The overall modified GUSS scores of two raters achieved high positive correlation (rs=0.961, P<0.01), and the overall severity rating of two raters appeared high consistency (κ=0.849, P<0.01, P0=0.900). Both raters confirmed 16 (40.0%) patients having severe dysphagia in the sample (κ=1.000, P<0.01, P0=1.000). The first rater classified 19 (47.5%) patients as having severe and moderate dysphagia, where the second rater classified 18 (45.0%) patients (κ=0.950, P<0.01, P0=0.975). The first rater found 7 (17.5%) patients with no dysphagia, but the second rater found 4 (10.0%) patients with no dysphagia (κ=0.688, P<0.01, P0=0.925).