In a Limited-Duration Prevalence session, the Race, Sex, Registry, County (Pop, Case Files) box on the Selection tab consists of race, sex, and geographic variables. These variables, along with date fields, are the variables in the population and case files but not in the standard population file. However, the date variables are not available in this box since prevalence percents require the population on the prevalence date, rather than the date of diagnosis. Therefore, the Prevalence Date specified on the Statistic tab is used for selecting the appropriate populations based on date. In a Limited-Duration Prevalence session, the Race, Sex, Registry, County (Pop, Case Files) box on the Selection tab consists of race, sex, and geographic variables. These variables, along with date fields, are the variables in the population and case files but not in the standard population file. However, the date variables are not available in this box since prevalence percents require the population on the prevalence date, rather than the date of diagnosis. Therefore, the Prevalence Date specified on the Statistic tab is used for selecting the appropriate populations based on date.
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