Table 3. Multivariate Cox regression analysis for progression free survival.
| Variables | HR (95% CI) | P value | ||
|---|---|---|---|---|
| Model 1 | ||||
| Bone metastasis > 10 | 1.65 (0.91–2.97) | 0.097 | ||
| Overall bone metastasis featurea | ||||
| Total metastasis ratio (metastatic bone/total bone) | 1.65 (0.94–2.90) | 0.084 | ||
| Metastasis intensity difference (maximum − minimum) | 0.53*** (0.36–0.79) | 0.002 | ||
| Model 2 | ||||
| Bone metastasis > 10 | 1.44 (0.88–2.35) | 0.143 | ||
| Largest metastatic lesion featurea | ||||
| Largest metastasis percentage (largest metastatic bone/total metastasis) | 0.62 (0.40–0.97) | 0.038 | ||
| Largest metastasis compactness (irregularity) | 1.17 (0.76–1.81) | 0.484 | ||
| Largest metastasis eccentricity | 1.16 (0.76–1.76) | 0.498 | ||
| Largest metastasis boundary standard deviation | 0.68 (0.45–1.00) | 0.053 | ||
HR = hazard ratio, CI = confidence interval.
aAI features were applied as binary variable (high vs low).
***P < 0.001.