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Perspect Clin Res. 2018 Oct-Dec;9(4):184-186. doi: 10.4103/picr.PICR_124_18.

Study designs: Part 1 - An overview and classification.

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Department of Anaesthesiology, Tata Memorial Centre, Mumbai, Maharashtra, India.
Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.


There are several types of research study designs, each with its inherent strengths and flaws. The study design used to answer a particular research question depends on the nature of the question and the availability of resources. In this article, which is the first part of a series on "study designs," we provide an overview of research study designs and their classification. The subsequent articles will focus on individual designs.


Epidemiologic methods; research design; research methodology

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