13.13 The prevalence of diabetes, by place of residence and sex, was ascertained from health records in a U.S. region, resulting in the following data (diabetes cases per population) stratified by age (years). Urban Counties Rural Counties Age Female Male Total Female Male Total 57 75 0-19 55,000 54,000 132 109,000 32 35 30,000 31,000 67 61,000 20-39 171 165 57,000 55,000 336 112,000 61 20,000 56 19,000 117 39,000 40-59 509 558 41,000 ad 40,000 1,067 81,000 179 60+ 574 260 834 11,000 201 202 11,000 381 W22,000 334 535 17,000 7,000 24,000 5,000 6,000 11,000