Table 2: Technique concordance by observer. Partial Discordance = an observer giving a one-grade difference between the two techniques. Complete discordance = a two point grade difference between the two techniques. Concordance = exact grading agreement for both techniques. Cohen's linear kappa interpretation: almost perfect (0.81 - 1.0), substantial agreement (0.61 - 0.80), moderate agreement (0.41 - 0.60).

Technique concordance by observer
Reader Partial discordance Complete discordance Concordance Cohen's linear kappa Max possible Std. error Actual as proportion of max
1 3/27
11 %
0/27 24/27
89%
0.8625 0.9592 0.0766 0.9039
2 6/27
22%
1/27
4 %
20/27
74%
0.616 0.957 0.123 0.643
3 8/27
30 %
1/27
4 %
18/27
67 %
0.583 0.917 0.121 0.636
Total 17/81
21%
2/81
2%
66/81
76%
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