Reducing Xerostomia by Comprehensive Protection of Salivary Glands in Intensity-Modulated Radiation Therapy with Helical Tomotherapy Technique for Head-and-Neck Cancer Patients: A Prospective Observational Study

Table 3

Predictors of patient-reported xerostomia scores.

Variable	Univariate analysis			Multivariate model
	Estimate	SE	P	Estimate	SE	P
OC Dmean	0.216	0.074	0.004	0.226	0.091	0.014
PG-T Dmean	0.226	0.098	0.023	-0.023	0.117	0.844
cSMG Dmean	0.317	0.089	0.001	0.183	0.089	0.043
Age	0.125	0.024	0.001	0.092	0.035	0.009
Stage (II-III vs. IV)	1.494	0.728	0.042	1.842	0.850	0.033
Gender	-1.323	0.832	0.114	-1.875	0.990	0.061
Unstimulated saliva flow rate	-4.632	1.497	0.002	-2.181	2.351	0.356
Stimulated saliva flow rate	-4.113	0.899	0.001	-1.892	1.465	0.200

Dmean: mean dose.