Table 3.
Linear Regression Results for 26 Texture Properties Compared With Cyst Score (% of Lung Occupied by Cysts) in 135 Chest HRCTs of Patients With LAM
| Texture Property | Texture Category | P | R |
|---|---|---|---|
| Mean | Histogram | < .001 | 0.524 |
| Variance | Histogram | .208 | –0.108 |
| Skewness | Histogram | .0051 | 0.238 |
| Kurtosis | Histogram | .0042 | 0.243 |
| Absolute deviation | Histogram | .661 | –0.038 |
| SD | Histogram | .571 | –0.049 |
| Energy | CM | < .001 | 0.799 |
| Inertia | CM | .546 | –0.052 |
| Inversedifference | CM | < .001 | 0.729 |
| Entropy | CM | < .001 | 0.756 |
| Correlation | CM | .724 | –0.030 |
| Sumentropy | CM | < .001 | 0.745 |
| Differenceentropy | CM | < .001 | 0.733 |
| Sum average | CM | .029 | 0.187 |
| Difference average | CM | < .001 | 0.286 |
| Short run emphasis | RL | < .001 | 0.752 |
| Long run emphasis | RL | < .001 | 0.800 |
| Gray-level nonuniformity | RL | < .001 | 0.493 |
| Run-length nonuniformity | RL | < .001 | 0.737 |
| Run percentage | RL | < .001 | 0.788 |
| Low-gray run emphasis | RL | < .001 | 0.737 |
| High-gray emphasis | RL | .953 | 0.005 |
| Short run low-gray emphasis | RL | .007 | -0.229 |
| Short run high-gray emphasis | RL | .758 | 0.027 |
| Long run low-gray emphasis | RL | < .001 | 0.841 |
| Long run high-gray emphasis | RL | .522 | –0.055 |
All textures values were plotted as the difference in texture near cysts compared with away from cysts. Texture properties in bold showed statistically significant correlation with cyst score after adjustment for initial cyst score. CM = co-occurrence matrix; RL = run-length.