8. Assume that we begin a study of 100 persons free of disease on January 1, and

Question

8. Assume that we begin a study of 100 persons free of disease on January 1, and that on the last day of each month throughout the year, we will be given a count of new cases of disease in this population. Assume that over the course of a full year, 15 of these persons develop disease. Two (2) of these cases were reported on March 31, five (5) more cases on June 30, five (5) cases on September 30 and three (3) cases on December 31 a) How many person-months did the study members contribute (assume patients become cases on the last day of the month)? (1 point) b) What is the incidence rate of this disease? (1 point)

Explanation / Answer

(b) Incidence rate of the disease = (15 cases per 100 persons) * 100% = 15%

(By definition, the incidence rate is the number of new cases per population at risk in a given time period.)

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