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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