Figure 2From: Dosimetric predictors of hypothyroidism in oropharyngeal cancer patients treated with intensity-modulated radiation therapyKaplan-Meier curves of freedom from hypothyroidism for subgroups of the patients with pre-radiation thyroid volumes ≥8 cc. The lower incidence group had thyroid volumes spared 45 Gy of ≥3 cc and the higher incidence group had volumes spared 45 Gy <3 cc.Back to article page