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Dichotomous dose-response assessment. 3a: Confirmatory analysis of the RPA-derived dose-threshold; ROC shows split performance for late T1 SI changes in superior pharyngeal constrictors above and below 62.25 Gy as an AUC of 0.707 (P=0.003, with H0 denoting AUC =0.5). 3b: Bivariate confirmatory analysis shows distributional plots of T1 SI alteration for superior pharyngeal constrictors, stratified by doses above and below 62.25 Gy.
