Table 1.
The intra-rater and inter-rater reproducibilities (root-mean-square average coefficient of variation values [%]) of the variables.
| Subchondral bone plate | Trabecular bone | Femur | ||||
|---|---|---|---|---|---|---|
| Parameter | Medial | Lateral | Medial | Lateral | Medial | Lateral |
| Intra-rater reproducibility | ||||||
| GV | 2.78 (2.23 – 3.56) | 2.79 (2.24 – 3.58) | 2.62 (2.10 – 3.36) | 1.45 (1.16 – 1.86) | 3.05 (2.45 – 3.92) | 5.06 (4.05 – 6.49) |
| GV’ | 7.13 (5.71 – 9.15) | 6.68 (5.36 – 8.57) | 13.99 (11.21 – 17.94) | 8.91 (7.14 – 11.42) | 9.53 (7.64 – 12.23) | 8.36 (6.70 – 10.73) |
| GVnorm | 2.77 (2.22 – 3.55) | 2.69 (2.16 – 3.46) | 2.70 (2.17 – 3.47) | 1.56 (1.25 – 2.00) | - | - |
| LBP/C | 3.33 (2.67 – 4.27) | 4.71 (3.77 – 6.04) | 1.45 (1.16 – 1.85) | 1.93 (1.54 – 2.47) | 1.37 (1.10 – 1.76) | 2.68 (2.15 – 3.44) |
| HILap | 2.17 (1.74 – 2.79) | 2.46 (1.97 – 3.16) | 1.64 (1.31 – 2.10) | 1.98 (1.58 – 2.54) | 1.32 (1.06 – 1.69) | 1.88 (1.51 – 2.41) |
| HILBP | 0.85 (0.68 – 1.09) | 0.93 (0.75 – 1.19) | 0.51 (0.41 – 0.65) | 0.75 (0.60 – 0.96) | 0.70 (0.56 – 0.90) | 1.02 (0.82 – 1.31) |
| ELap | 1.46 (1.17 – 1.87) | 1.59 (1.27 – 2.04) | 0.74 (0.59 – 0.95) | 1.01 (0.81 – 1.29) | 0.70 (0.56 – 0.89) | 0.94 (0.75 – 1.20) |
| ELBP | 0.42 (0.34 – 0.54) | 0.56 (0.44 – 0.71) | 0.23 (0.18 – 0.29) | 0.26 (0.21 – 0.33) | 0.29 (0.23 – 0.37) | 0.35 (0.28 – 0.44) |
| Inter-rater reproducibility | ||||||
| GV | 4.37 (3.50 – 5.60) | 3.10 (2.49 – 3.98) | 4.33 (3.47- 5.55) | 2.51 (2.01 – 3.21) | 4.75 (3.81 – 6.09) | 6.11 (4.90 – 7.83) |
| GV’ | 11.85 (9.50 – 15.21) | 9.45 (7.58 – 12.13) | 22.19 (17.79 – 28.47) | 12.56 (10.07 – 16.11) | 16.21 (13.00 – 20.80) | 12.19 (9.77 – 15.64) |
| GVnorm | 4.54 (3.64 – 5.82) | 4.00 (3.21 – 5.13) | 4.13 (3.31 – 5.30) | 2.47 (1.98 – 3.17) | - | - |
| LBP/C | 3.19 (2.55 – 4.09) | 3.27 (2.62 – 4.19) | 2.49 (2.00 – 3.20) | 1.93 (1.55 -2.48) | 2.21 (1.77 – 2.83) | 3.20 (2.56 – 4.10) |
| HILap | 1.74 (1.39 – 2.23) | 1.90 (1.53 – 2.44) | 2.48 (1.99 – 3.19) | 2.05 (1.64 – 2.63) | 1.51 (1.21 – 1.94) | 2.04 (1.63 – 2.62) |
| HILBP | 0.95 (0.76 – 1.22) | 1.04 (0.84 – 1.34) | 0.67 (0.53 – 0.85) | 0.90 (0.72 – 1.15) | 1.06 (0.85 – 1.35) | 1.25 (1.00 – 1.60) |
| ELap | 0.88 (0.70 – 1.13) | 0.89 (0.71 – 1.14) | 1.00 (0.80 – 1.28) | 1.04 (0.84 – 1.34) | 0.99 (0.79 – 1.27) | 1.07 (0.86 – 1.37) |
| ELBP | 0.57 (0.46 – 0.73) | 0.52 (0.42 – 0.67) | 0.31 (0.25 – 0.40) | 0.29 (0.23 – 0.37) | 0.41 (0.33 – 0.53) | 0.39 (0.31 – 0.50) |
Values in parentheses are the 95% confidence interval. GV = mean grayscale value, GV’ = soft tissue subtracted from GV, GVnorm = GV divided by the depth of the tibia, LBP/C = local binary patterns based contrast measure, HILap = homogeneity index from Laplacian-based image, HILBP = homogeneity index from LBP-based image, ELap = entropy from Laplacian-based image, and ELBP = entropy from LBP-based image.