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Table 3 Average weighted inter-observer kappa (IEK, time point t1 and t2)

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

Comparison Percentage agreement Weighted kappa Standard error Confidence interval P-value
Tendonosis (IEK)      
Rater 1, rater 2, t1 81.5% 0.74 0.07 (0.59, 0.88) <0.0001
Rater 1, rater 3, t1 67.7% 0.55 0.09 (0.38, 0.72) <0.0001
Rater 2, rater 3, t1 81.5% 0.72 0.08 (0.57, 0.87) <0.0001
Rater 1, rater 2, t2 80.0% 0.73 0.07 (0.60, 0.87) <0.0001
Rater 1, rater 3, t2 76.9% 0.65 0.08 (0.49, 0.82) <0.0001
Rater 2, rater 3, t2 80.0% 0.73 0.07 (0.59, 0.87) <0.0001
Total range (t1, t2) 68%–82% 0.55–0.74    
Mean (t1, t2) 78% 0.69    
Tear thickness (IEK)      
Rater 1, rater 2, t1 66.2% 0.69 0.06 (0.57, 0.81) <0.0001
Rater 1, rater 3, t1 67.7% 0.73 0.06 (0.61, 0.84) <0.0001
Rater 2, rater 3, t1 72.3% 0.78 0.05 (0.68, 0.87) <0.0001
Rater 1, rater 2, t2 75.4% 0.80 0.05 (0.71, 0.89) <0.0001
Rater 1, rater 3, t2 69.2% 0.74 0.06 (0.68, 0.85) <0.0001
Rater 2, rater 3, t2 78.5% 0.84 0.04 (0.77, 0.92) <0.0001
Total range (t1, t2) 66%–79% 0.69–0.84    
Mean (t1, t2) 72% 0.76    
AP extent (IEK)      
Rater 1, rater 2, t1 61.5% 0.57 0.07 (0.43, 0.71) <0.0001
Rater 1, rater 3, t1 61.5% 0.57 0.07 (0.42, 0.72) <0.0001
Rater 2, rater 3, t1 78.5% 0.80 0.05 (0.70, 0.90) <0.0001
Rater 1, rater 2, t2 78.5% 0.77 0.06 (0.65, 0.89) <0.0001
Rater 1, rater 3, t2 64.6% 0.64 0.07 (0.51, 0.77) <0.0001
Rater 2, rater 3, t2 75.4% 0.79 0.05 (0.70, 0.89) <0.0001
Total range (t1, t2) 62%–79% 0.57–0.80    
Mean (t1, t2) 70% 0.69    
Total score (IEK)      
Rater 1, rater 2, t1 38.5% 0.65 0.05 (0.55, 0.75) <0.0001
Rater 1, rater 3, t1 36.9% 0.63 0.05 (0.52, 0.73) <0.0001
Rater 2, rater 3, t1 61.5% 0.80 0.04 (0.72, 0.89) <0.0001
Rater 1, rater 2, t2 61.5% 0.80 0.04 (0.72, 0.88) <0.0001
Rater 1, rater 3, t2 52.3% 0.71 0.05 (0.61, 0.81) <0.0001
Rater 2, rater 3, t2 58.5% 0.80 0.04 (0.73, 0.88) <0.0001
Total range (t1, t2) 39%–62% 0.63–0.80    
Mean (t1, t2) 52% 0.73