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).

<p>Notes: <i>c</i> - the generalized scale parameter of age dimension which characterizes the age of maximal incidence; <i>m</i> (<i>m</i>-stages) - the number of stages occurring during individual’s life and leading to the cancer diagnosis; <i>n</i> - the parameter running over different types of frailty distributions (e.g., <i>n</i> = 1 and <i>n</i> = 2 correspond to gamma-distribution and inverse Gaussian distribution); <i>σ</i> - characterizes the standard deviation of the frailty distribution (the distribution of cancer predisposition in population); <i>R_sex</i> and <i>R_race</i> 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.