Fig. 1

Reduced saliva volume in irradiated groups. Saliva volume in all treatment groups before irradiation (baseline), right after treatment termination (day 9 for protons, day 12 for X-rays), and at different time points after irradiation (days 35, 70, and 105). P-values are shown only between groups with p ≤ 0.05. Data are presented as mean ± 95% CI. TM = transmission protons, BP = Bragg peak protons.