3. What measure of disease frequency is each of the following? (Incidence densit

Question

3. What measure of disease frequency is each of the following? (Incidence density, cumulative incidence, period prevalence, point prevalence) The percentage of 70-year-old men living in Harris County who develop pneumonia between January 1, 2011 and December 31, 2011 a. b. The percentage of women who delivered babies on December 31, 2010. The percentage of fifth graders who meet the criteria for obesity during the 2011-2012 school year. c. The number of live-born babies who die of sudden infant death syndrome during the first year of life per 100,000 baby-years of follow-up d.

Explanation / Answer

A. Incidence density. This is because the example attempts to measure the number of new cases per population at risk in a given time period

B. Point prevalence. This is because the example attempts to measure the proportion of women who delivered babies on a specific date.

C. Period prevalence. This is because here an attempt is being made to measure the number of cases who are already obese along with new cases of obesity during a period of time.

D. Cumulative incidence. This is because in this example, the number of new cases after the follow up with respect to the population ascertained at the beginning of the study is being measured.

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