Table 3.
Histogram and GLCM parameters between PTC patient groups with and without ETE.
| Variable | ETE | Without ETE | P value |
|---|---|---|---|
| Entropy | 6.40 ± 0.71 | 5.60 ± 0.40 | .000 |
| Standard deviation | 11.47 (8.23, 15.67) | 8.19 (5.49, 11.45) | .001 |
| Energy (×10−2) | 0.27 (0.15, 0.38) | 0.51 (0.33, 0.71) | .000 |
| Correlation (×10−2) | 0.31 (0.25, 0.75) | 0.63 (0.33, 1.15) | .001 |
| Mean value | 65.50 ± 24.94 | 58.12 ± 20.97 | .059 |
| Skewness | 0.09 ± 0.57 | 0.17 ± 0.57 | .442 |
| Kurtosis | 0.18 ± 0.54 | 0.32 ± 0.49 | .269 |
| Contrast | 82.51 ± 79.57 | 69.11 ± 121.38 | .471 |
| Inverse difference moment | 0.21 ± 0.08 | 0.23 ± 0.07 | .129 |
ETE = extrathyroidal extension, GLCM = gray-level co-occurrence matrix, PTC = papillary thyroid carcinoma.