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. Author manuscript; available in PMC: 2016 Mar 10.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2015 Apr 30;92(4):935–944. doi: 10.1016/j.ijrobp.2015.02.048

Fig. 1.

Fig. 1

Predictors in the final multivariable model, using transformed variables to simplify the model. No regression coefficients are estimated for the treatment cohorts as overall survival is estimated by the Kaplan-Meier method for the strata (treatment cohorts). EQD2 = equivalent dose in 2-Gy fractions; GTV = gross tumor volume; OTT = overall treatment time; WHO-PS = World Health Organization performance status.