Race and ethnicity have a profound influence on disease patterns and can be particularly difficult to measure.
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Q39: Most epidemiologists prefer to use the relative
Q40: Crude rates are summary measures of disease
Q41: Although U.S. birth and death data pertain
Q42: The primary purpose of the census is
Q43: Mortality data are adequate for examining nonfatal
Q45: Observational studies suffer the same ethical and
Q46: Ecological studies can be done quickly and
Q47: Trials that prevent or delay the onset
Q48: When trials involve procedures rather than pills,
Q49: Retrospective cohort studies are considered less vulnerable
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