Longitudinal studies: (DNB June 11)
|B||Are less efficient|
|D||For identifying risk factors of disease|
In longitudinal studies, observations are repeated in the same population over a prolonged period of time by means of follow-up examinations. Longitudinal studies are useful:
a. To study the natural history of disease and its future outcome
b. For identifying risk factors of disease
c. For finding out incidence rate or rate of occurrence of new cases of disease in the community.