Normal tissue complication probability model parameter estimation for xerostomia in head and neck cancer patients based on scintigraphy and quality of life assessments

Table 2 Factors analysis with parotid gland function

Factors*	Spearman’s correlation	β-value	95% confidence interval	Univariate analysis (p-value)	Multivariate analysis (p-value)
Parotid mean dose	−0.807	−0.759	−0.25-−0.15	< 0.001	< 0.001
Age (≥ 50 vs. <50)	0.146	0.141	−3.28-24.92	0.26	0.13
Tumor site (oral cavity vs. non-oral cavity)	−0.116	−0.101	−40.55-25.12	0.37	0.64
Surgery (yes vs. no)	−0.052	−0.092	−40.27-26.17	0.69	0.67
Chemotherapy (yes vs. no)	0.017	0.166	−1.37-27.24	0.90	0.08

*Factors associated with recovery of parotid gland function at 1 year after radiotherapy.

ISSN: 1471-2407