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(a) Mean residual error from LOOCV by using each feature group, i.e. clinical features, DVH features and combination of clinical and DVH features. The prediction accuracy when using the combination of clinical and DVH features was significantly improved (P < 0.05 and 0.005, respectively, paired t-test). (b) Survival curve using actual and predicted survival time. There is no significant difference (P = 0.18, log-rank test).
