What was the cumulative incidence of HSV infections during the second year of th

Question

What was the cumulative incidence of HSV infections during the second year of the study among smokers and E-cigarette users? Express your answer per 1 000 people

Consider the following information and data to answer the questions that follow A study was done to investigate the occurrence of cold sores, caused by HSV, among cigarette smokers as compared to E-cigarette users. The study was performed over a 4 year period among 1000 cigarette smokers and 2000 E-cigarette users. At the beginning of the study each individual was screened to verify the presence of latent HSV, an incurable infection. Total cases Year of E-cigarette study Cigarette 20 30 2 105 40

Explanation / Answer

Answer:

Cumulative incidence is a measure of disease frequency that addresses the question "How far has the disease spread during a specified period of time?" It is calculated using the following formula:

(Number of new cases) / (Total population at risk)

Total population of cigarette smoker is 1000 and E-cigarette is 20000.

Cumulative incident of HSV infection , during the second year among smokers and E-cigarette smokers will be 40/1000 and 105/ 2000 respectively.

If we have to express per 1000 people it will be as (40/1000) X1000 for smokers

and (105/2000) X 1000 for E-cigarette smokers

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