Fig. 3From: Risk factors for aspiration pneumonia during concurrent chemoradiotherapy or bio-radiotherapy for head and neck cancerAdjusted Kaplan-Meier curve illustrating overall survival from the date of initiation of chemoradiotherapy or bio-radiotherapy stratified according to whether they developed aspiration pneumonia. Vertical dashes indicate censored observations. HR: hazard ratio, CI: confidence interval, OS: overall survivalBack to article page