The results of model fitting (presented as fitted parameters ±SE) for ACs and SCCs, SEER registry data, 1973–2003. (Parameters are summarized for both sexes and both races–see description of symbols used in headline in text).

Notes: c - the generalized scale parameter of age dimension which characterizes the age of maximal incidence; m (m-stages) - the number of stages occurring during individual’s life and leading to the cancer diagnosis; n - the parameter running over different types of frailty distributions (e.g., n = 1 and n = 2 correspond to gamma-distribution and inverse Gaussian distribution); σ - characterizes the standard deviation of the frailty distribution (the distribution of cancer predisposition in population); Rsex and Rrace describe the relative risks of cancer incidence in females and in African-American population, respectively; and characterizes the percent change in cancer incidence rates for a 10-year period.