Cox Proportional Hazards Models for Overall Survival.

Abbreviations: Hazard Ratio, HR; Confidence Intervals, CI.Statistically significant hazard ratios (p 1 The imaging features are dichotomized at their respective median values and age is dichotomized at 65 years2 Each imaging biomarker is analyzed independently in separate univariate models. The unadjusted HRs represent the main effects of each covariate.3 Based on forward selection, only two imaging biomarkers are included in the model but excluded age, gender, and stage.4 Only two imaging biomarkers are included in the model in addition to age, gender, and stageCox Proportional Hazards Models for Overall Survival.