Parameter Number of patients
Mean Age at presentation (years± SD) 63± 13.9
Gender (n, %) Male Female 522 (74.4) 180 (25.6)
Active or ex-smokers (n,%) Yes No 393 (56) 309 (44)
Active or ex-drinkers (n, %) Yes No 209 (29.8) 493 (70.2)
Sites of primary malignancies (n, %) Oral cavity Larynx Hypopharynx Oropharynx Paranasal sinuses and nasal cavity 356 (50.7) 126 (17.9) 110 (15.7) 74 (10.5) 33 (4.7)
Stages of primary malignancies (n, %) Stage 1 Stage 2 Stage 3 Stage 4 162 (23.3) 92 (13.1) 89 (12.7) 357 (50.9)