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a. Mean age at diagnosis of 59.0, 57.0, and 54.9 years with grade 1 (n = 435), grade 2 (n = 1964), and grade 3 (n = 136) OSCC, respectively. b. Mean survival time over 120 months (from OSCC diagnosis to death or to June 30, 2019) of 52.4, 43.9, and 33.1 months with grade 1, grade 2, and grade 3 OSCC, respectively.
