“…These categories were chosen to represent ranges for palliative and definitive dosing of external beam radiation therapy. 3 , 4 , 5 , 13 , 14 , 15 , 16 In a manner consistent with previous studies, 17 , 18 age was included as a categorical variable (18–34, 35–49, 50–64, 65–79, ≥80 y). Survival models with age as a continuous variable were created as sensitivity analyses, yielding similar results (data available on request).…”