Which statement is true about mortality rates? Mortality rates:
a. are informative only for fatal diseases.
b. provide information about existing disease in the population.
c. are calculated using a population estimate at year-end.
d. reveal the risk of getting a particular dis-ease.
ANS: A
Mortality rates are informative only for fatal diseases and do not provide direct information about the level of existing disease or the risk of getting a particular disease. Because the popula-tion changes during the course of a year, typically an estimate of the population at midyear is taken as the denominator for annual rates, because the midyear population approximates the amount of person-time contributed by the population during a given year.
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