Saturday, September 26, 2020

THE AFTER-ONLY STUDY DESIGN

 

In an after-only design the researcher knows that a population is being, or has been, exposed to a medical intervention and wishes to study its impact on the population.  In this type of design, baseline information (pre-test or before observation) is usually constructed either on the basis of respondents’ recall of the situation before the intervention, or from information available in existing records, such as secondary sources.  Let’s take an example, if one is looking at most common side effects of Plaziquantel.  This drug is already being distributed in community surrounding shores of Lake Victoria to prevent spread and transmission of Bilharzias.

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