In a past CDC study, there was an outbreak of the flu among low-income workers a
ID: 3061047 • Letter: I
Question
In a past CDC study, there was an outbreak of the flu among low-income workers and the CDC wanted to do a one-year study to see how bad the flu was. At the beginning of the study, one hundred low-income workers who didn’t have the flu were enrolled in the study and was followed for twelve months. The researchers check on participants at the half of the year mark (six Months) and the end of the year (twelve months). After a year, the researchers were able to gather the data and get the results of the study.
The results of the study were: Among all the participants, only two of the participants from the study were affected by the flu after six months. Forty of the workers who didn’t get affected by the flu left the study after six months, and at the end of the study (twelve months), eighteen participants were affected by the flu. Please calculate the: 1) Cumulative Incidence (CI), 2) The prevalence of the flu at the end of the CDC study, and 3) The incidence rate using person-months. Please round the answers to the nearest thousandths (.000) and show your work.
Explanation / Answer
1) Cumulative incidence
Assuming cumulative incidence is for the 6 month period
Cumulative incidence=Number of new cases/ Population at risk
Number of new cases=2
Population at risk=100
Cumulative incidence=2/100=0.02
2) Prevelance of flu at the end of the study
Point prevelance=Number of current cases (new and preexisting) at a specified point in time/ Population at the same specified point in time.
Population at the end of study=60
Number of cases at the time=18
Prevalence=18/60=0.300
3) incidence rate
Incidence rate=Number of new cases of disease or injury during specified period / Time each person was observed, totaled for all persons
60 persons were observed for 12 months.
40 persons were observed for 6 months
Time observed for all patients=(60*12)+(40*6)=960
Number of cases=18
Incidence rate=18/960=0.019
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