Table 3. Intraclass correlation coefficients and Bland-Altman analyses of PET parameters.
| Variables | Intraclass Correlation Coefficient (ICC) | Bland-Altman analysis | ||||
|---|---|---|---|---|---|---|
| ICC | 95% CI | Precision (%) | Mean | Variation (%) | LRLa–URLb (%) | |
| SUVmax | 0.993 | 0.989–0.996 | 0.35 | 1.5 | 25.4 | -11.2–14.2 |
| SUV mean | 0.994 | 0.990–0.997 | 0.35 | 2.3 | 18.1 | -6.7–11.4 |
| TLG | 0.993 | 0.988–0.996 | 0.40 | 3.5 | 43.8 | -18.4–25.4 |
| Texture parameters | ||||||
| SUV entropy | 0.949 | 0.915–0.970 | 2.75 | 0.1 | 9.7 | -4.7–5.0 |
| Uniformity | 0.956 | 0.926–0.974 | 2.40 | 0.2 | 56.6 | -28.1–28.5 |
| Entropy | 0.987 | 0.978–0.992 | 0.70 | 0 | 9.8 | -4.90–4.90 |
| Dissimilarity | 0.975 | 0.964–0.987 | 1.15 | -0.1 | 22.7 | -11.4–11.3 |
| Homogeneity | 0.977 | 0.962–0.987 | 1.25 | -0.4 | 16.7 | -8.7–8.0 |
| Coarseness | 0.982 | 0.970–0.990 | 1.00 | -0.6 | 33.0 | -17.1–15.9 |
| Busyness | 0.996 | 0.993–0.998 | 0.25 | -0.6 | 52.9 | -27.1–25.8 |
| Contrast | 0.983 | 0.971–0.990 | 0.95 | -2.3 | 104.9 | -54.8–50.1 |
| Complexity | 0.975 | 0.958–0.986 | 1.40 | -1.0 | 67.1 | -34.5–32.6 |
| Grey-level nonuniformity | 0.998 | 0.997–0.999 | 0.10 | -1.5 | 45.2 | -24.1–21.1 |
| Zone-size nonuniformity | 0.997 | 0.994–0.998 | 0.20 | -1.2 | 74.4 | -38.4–36.0 |
| High grey-level large zone emphasis | 0.919 | 0.865–0.952 | 4.35 | 4.5 | 80.6 | -35.4–44.8 |
aLRL: lower reproducibility limit
bURL: upper reproducibility limit.