Incidence rate numerator number of new cases between October 1 and September 30

# Incidence rate numerator number of new cases between

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Incidence rate numerator = number of new cases between October 1 and September 30= 4 (the other 6 all had onsets before October 1, and are not included)Incidence rate denominator = April 1 population= 18 (persons 2 and 8 died before April 1)Incidence rate = (4 ⁄ 18) × 100= 22 new cases per 100 populationExample B:Calculate the point prevalence on April 1, 2005. Point prevalence is the number of persons ill on the date divided by the population on that date. On April 1, seven persons (persons 1, 4, 5, 7, 9, and 10) were ill.Point prevalence = (7 ⁄ 18) × 100= 38.89%Example C:Calculate the period prevalence from October 1, 2004, to September 30, 2005. The numerator of period prevalence includes anyone who was ill any time during the period. In Figure 3.1, the first 10 persons were all ill at some time during the period.Period prevalence = (10 ⁄ 20) × 100= 50.0%Exercise 3.2For each of the fractions shown below, indicate whether it is an incidence proportion, incidence rate, prevalence, or none of the three.A.Incidence proportionB.Incidence rateC.PrevalenceD.None of the above____ 1.
number of women in Framingham Studywho have died through last year from heart disease number of women initially enrolled inFramingham Study____ 2.number of women in Framingham Study who have diedthrough last year from heart disease number of person-years contributed through last year bywomen initially enrolled in Framingham Study____ 3.number of women in town of Framingham who reported having heart disease in recent health surveyestimated number of women residents of Framingham during same period____ 4.number of women in Framingham Study newly diagnosed with heart disease last year number ofwomen in Framingham Study without heart diseaseat beginning of same year____ 5.number of women in State A newly diagnosed with heart disease in 2004 estimated number ofwomen living in State A on July 1, 2004____ 6.estimated number of women smokers in State A according to 2004 Behavioral Risk Factor Survey estimated number of women living in State A on July 1, 2004____ 7.number of women in State A who reported heart disease in 2004 health survey estimated numberof women smokers in State A according 2004 Behavioral Risk Factor SurveyCheck your answer.References (This Section)1.Last JM. A dictionary of epidemiology, 4th ed. New York: Oxford U. Press; 2001.2.Hopkins RS, Jajosky RA, Hall PA, Adams DA, Connor FJ, Sharp P, et. al. Summary of notifiable diseases — United States, 2003. MMWR 2003;52(No 54):1–85.3.U.S. Census Bureau [Internet]. Washington, DC: [updated 11 Jul 2006; cited 2005 Oct 2]. Population Estimates. Available from: .4.Williams LM, Morrow B, Lansky A. Surveillance for selected maternal behaviors and experiences before, during, and after pregnancy: Pregnancy Risk Assessment Monitoring System (PRAMS). In: Surveillance Summaries, November 14, 2003. MMWR 2003;52(No. SS-11):1–14.Next Page: Mortality Frequency Measures
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