Figure 5.

Summary of the 25/20-Gy guidelines for radiotherapy in head and neck cancer patients applied to the quality of life (QoL) data at 1 year after radiotherapy. The rate of xerostomia for plans meeting the QUANTEC guideline was zero, resulting in a NPV of 100% under the cut-off point. black circle: Grade 3⁺ xerostomia; white circle: No grade 3⁺ xerostomia.