Figure 1From: Normal tissue complication probability model parameter estimation for xerostomia in head and neck cancer patients based on scintigraphy and quality of life assessments The observed salivary excretion factor (SEF) data and the fitted dose–response curve for the normal tissue complication probability of the incidence of grade 3 + xerostomia (salivary flow ≤45% relative to pre-RT) at 1 year after radiotherapy as a function of the mean dose to the spared parotid gland. Dashed lines show 95% confidence intervals for the model fit to the SEF data (solid line). The squares represented the group patient mean doses in bins 4-Gy width. (All individual dose data points were used in the NTCP fitting).Back to article page