This model calculates the number of members expected to be positive for hepatitis C (HCV) and have the chronic form of the virus for each plan type by using this formula:

((Number of Members * Percent by Plan Type) * Prevalence Rate for each Plan Type)* 85%

Example: For a population of 100,000 commercially insured members, 470 would be expected — based on the literature — to be HCV+. This is adjusted by a factor of .85 to account for the percentage expected to have chronic HCV, resulting in a final estimate of 400.

Source: See this article for more details: Dennison MM, Jiles RB, Drobeniuc J, et al. Chronic hepatitis c virus infection in the United States, National Health and Nutrition Examination Survey 2003 to 2010. Annals of Internal Medicine. 2014;160(5):293-300-300.