Disease Frequency

1 the cumulative incidence rate in a population of

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1. The cumulative incidence rate in a population of 100,000 people where 9 new cases of disease were reported within 1 year. The estimated risk (R)= New cases (A)/Persons at risk (N) R = 9/100,000 = 0.009% 2. The prevalence of a chronic disease on November 1st where 9 initial cases were found in September with an additional 45 cases reported in October of a small city with a population of 75,000 people. Prevalence (P) = Cases(C) / Number of people (P) = (9 + 45) / 75,000 = 0.072%

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3. The relative risk of death from exposure A if the mortality rate in the exposed group is 60 deaths per 1000 person-years and the mortality rate in the unexposed group is 20 per 1000 person-years. RR = incidence among exposed / incidence among unexposed. = (60/1000) / (20/1000) = 60/20 = 3 Hence, the risk of death among exposed group is 3 times than that of the unexposed group. The prevalence of a health condition is the existing number of cases of that condition in the population. State whether the factors listed below are likely to increase or decrease the prevalence of a health condition and explain your reasoning.
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