Prognostic factors correlation ranking for the 3- and 12-month time points by LASSO.

Abbreviation: AJCC: American Joint Committee on Cancer; XER3m: xerostomia at 3-month time point; XER12m: xerostomia at 12-month time point; SIB: simultaneous integrated boost; SQM: sequential mode; Dmean-c: mean dose to the contralateral parotid glands; Dmean-i: mean dose to the ipsilateral parotid glands;