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Table 4 Intra-rater reliability

From: Validity and reliability of using photography for measuring knee range of motion: a methodological study

  Mean Rater Day 1 Mean Rater Day 2 Mean Difference (95% CI) Difference p-value (2-sided) Concordance Correlation Coefficient (95% CI) B-A Mean Difference (95% Limits of Agreement)
Marker Method
Flexion       
RF Day 1 v Day 2 91.5 91.9 0.5 (-0.1 to 1.1) 0.13 0.997 (0.996 to 1.0) 0.5 (-2.2 to 3.1)
PT Day 1 v Day 2 90.1 90.4 0.3 (-0.2 to 0.8) 0.24 0.998 (0.997 to 1.0) 0.3 (-2.0 to 2.6)
OS Day 1 v Day 2 90.8 89.7 -1.1 (-2.9 to 0.6) 0.19 0.981 (0.967 to 1.0) -1.1 (-8.9 to 6.6)
Extension
RF Day 1 v Day 2 13.8 14.9 1.1 (-0.5 to 2.7) 0.14 0.980 (0.966 to 0.995) 1.1 (-2.9 to 5.1)
PT Day 1 v Day 2 12.1 13.3 1.2 (0.0 to 2.4) 0.05 0.983 (0.971 to 0.995) 1.2 (-1.8 to 4.3)
OS Day 1 v Day 2 12.8 14.1 1.3 (-1.6 to 4.2) 0.32 0.941 (0.906 to 0.977) 1.3 (-6.1 to 8.7)
Line of Femur Method
Flexion
RF Day 1 v Day 2 92.1 93.0 0.9 (0.0 to 1.7) 0.05 0.995 (0.992 to 0.999) 0.9 (-2.9 to 4.6)
PT Day 1 v Day 2 90.5 90.8 0.3 (-0.3 to 0.9) 0.29 0.998 (0.997 to 1.0) 0.3 (-2.2 to 2.8)
OS Day 1 v Day 2 92.4 92.3 -0.1 (-0.6 to 0.5) 0.73 0.998 (0.997 to 1.0) -0.1 (-2.5 to 2.3)
Extension
RF Day 1 v Day 2 15.0 16.4 1.4 (0.2 to 2.7) 0.03 0.983 (0.971 to 0.995) 1.4 (-1.7 to 4.6)
PT Day 1 v Day 2 9.1 9.3 0.2 (-0.9 to 1.2) 0.72 0.990 (0.983 to 0.997) 0.7 (-2.5 to 2.9)
OS Day 1 v Day 2 14.0 14.4 0.4 (-1.1 to 2.0) 0.54 0.987 (0.978 to 0.996) 0.4 (-3.6 to 4.5)
  1. RF = research fellow; PT = physiotherapist; OS = orthopaedic surgeon; v = versus; B-A = Bland-Altman