Question

To determine the long-term effectiveness of influenza vaccines in elderly people, groups of vaccinated elderly and unvaccinated community-dwelling elderly were studied. The results suggest that the elderly who are vaccinated have a reduced risk of hospitalization for pneumonia or influenza. A crude measure of association was calculated and found to be 3.01 and the MH adjusted measure of association was found to be 2.98. What is the study design?

Answer 1

The study design is cohort study. In this study design, a group is given a particular treatment or have a condition. This group is tracked for a period of time and they are compared with another group, who are not given the treatment or do not have the condition. The same has been done here.

Influenza vaccination is given to a group and checked their effectiveness in long term. They are then compared with another group, who do not receive any such treatment. This is a cohort study design.