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Table 2 Average weighted intra-observer kappa (IAK, time points t1 and t2)

From: Reliability of a 3 T MRI protocol for objective grading of supraspinatus tendonosis and partial thickness tears

Comparisons Percentage agreement Weighted kappa Standard error Confidence interval P-value
Tendonosis (IAK; t1, t2)      
Rater 1 93.9% 0.93 0.03 (0.86, 1.00) <0.0001
Rater 2 90.8% 0.85 0.06 (0.74, 0.97) <0.0001
Rater 3 87.7% 0.84 0.05 (0.74, 0.95) <0.0001
Range 88%–94% 0.84–0.93    
Mean 90.8% 0.88    
Tear thickness (IAK; t1, t2)      
Rater 1 78.5% 0.84 0.04 (0.75, 0.92) <0.0001
Rater 2 81.5% 0.84 0.04 (0.76, 0.93) <0.0001
Rater 3 78.5% 0.84 0.04 (0.76, 0.92) <0.0001
Range 79%–82% 0.84    
Mean 79.5% 0.84    
AP extent (IAK; t1, t2)      
Rater 1 72.3% 0.74 0.06 (0.63, 0.84) <0.0001
Rater 2 78.5% 0.84 0.04 (0.76, 0.91) <0.0001
Rater 3 80.0% 0.83 0.04 (0.74, 0.92) <0.0001
Range 72%–80% 0.74–0.84    
Mean 76.9% 0.80    
Total score (IAK; t1, t2)      
Rater 1 61.5% 0.83 0.03 (0.76, 0.89) <0.0001
Rater 2 63.1% 0.85 0.03 (0.79, 0.91) <0.0001
Rater 3 58.5% 0.84 0.02 (0.79, 0.90) <0.0001
Range 59%–63% 0.83–0.85    
Mean 61.0% 0.84