4.1.4 Incidence/Prevalence Data

Most health impact functions, such as those developed from log-linear or logistic health impact

functions, estimate the percent change in a health effect associated with a pollutant change. In

order to estimate the absolute change in incidence using these functions, the baseline incidence

rate (and in some cases the prevalence rate) of the adverse health effect are needed.

The incidence rate is the number of health effects per person in the population per unit of time,

and the prevalence rate is the percentage of people that suffer from a particular chronic illness.

For example, the incidence rate for asthma attacks may be 25 cases per asthmatic individual per

year, and the prevalence rate (measuring the percentage of the population that is asthmatic) might

be six percent.

NOTE: For both incidence and prevalence rates, BenMAP allows the user to have rates that

vary by race, ethnicity, gender, and age group. BenMAP can support multiple sets of incidence

and prevalence rates, if the rates differ by year or by grid definition.

To start adding incidence and prevalence data files, click on the Edit button below the

Incidence/Prevalence DataSets box. The Manage Incidence DataSets window will




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