| Internal Validation Cohort (n = 216) | External Validation Cohort (n = 50) |
---|---|---|
Patient Demographics | ||
 Age (yrs) | 58 (10) | 60 (13) |
 Male n | 176 (81) | 46 (92) |
 Xerostomia > 2 n | 87 (40) | 14 (28) |
 TomoTherapy n | 16 (7) | 22 (44) |
Tumor Site | ||
 Oropharynx | 92 (43) | 27 (54) |
 Oral Cavity | 49 (23) | 13 (26) |
 Nasopharynx | 13 (6) | 6 (12) |
 Hypopharynx | 4 (2) | 0 (0) |
 Larynx | 19 (9) | 3 (6) |
 Thyroid | 5 (2) | 0 (0) |
 Accessory Sinuses | 7 (3) | 1 (2) |
 Other | 27 (12) | 0 (0) |
DVH Parameters | ||
 cPG D40 (Gy) | 27.8 (14.7) | 22.8 (9.9) |
 cSG D60 (Gy) | 56.8 (23.5) | 49.5 (17.8) |