Figure 2

Multivariate backwards linear regression for the largest subgroups, based on the significant predictive factors for xerostomia during meals (Figure 2A) and in rest (Figure 2B). The score (predicted and actual according the data) for IMRT (black square and open square) as well as Control (black triangle and open triangle) for each defined subgroup with standard error are shown. IV2.5-, interval between radiotherapy and questionnaire (RT-Q) of < 2.5 years, IV2.5+: interval RT-Q > 2.5 years, SU-: no previous surgery, SU+: previous surgery, N0: N0 disease, N2: N2 disease. CT-: no chemotherapy, Ct+: chemotherapy.