In order to determine the correlation between per capita annual income and the annual rate of teenage pregnancy (two variables), an epidemiological study compared per capita annual income and the annual rate of teenage pregnancy in Massachusetts counties in 2012. This is an example of a cross-sectional study.
Each adult, child, and even a newborn are included in the calculation of per capita income. This contrasts with other popular measures of an area's wealth such household income, which counts everyone living in one home, and family income, which considers everyone living in the same household who is connected to another person by birth, marriage, or adoption as a family.
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