Fig. 6.

C-indexes of Radiation Esophagitis (RE) events. This figure shows the C-indexes of Cox regression models with (1) patients numbers at each of the 7 time points, (2) initial RE grade, (3) maximum RE grade, (4) RE evolution, (5) the onset timing of first RE event and (6) the timings of the maximum RE grades. From (2) to (6), C-indexes of multivariable of RE events incorporating with significant clinical variables (color), C-indexes of multivariable only with significant clinical variables (black), C-indexes of univariate models (dashed color). The same horizon refers to the results at same conditional time points.(For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)