The data reporting that sickle cell disease affects approximately 1 in 600 American blacks is an example of which concept?

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Prevalence rate is the proportion of the population affected by a disease at a specific point in time. Thus both the incidence rate and the length of the survival period in affected individuals determine prevalence. The incidence rate is the number of new cases of a disease reported during a specific period (typically 1 year), divided by the number of individuals in the population. A numerical expression representing a part of a larger whole or proportion is considered a ratio. Any factor that increases the chance of disease or injury is considered a risk.

The Data Reporting That Sickle Cell Disease Affects Approximately 1