%0 Journal Article %T Study designs: Part 3 - Analytical observational studies %A Priya Ranganathan %A Rakesh Aggarwal %J Archive of "Perspectives in Clinical Research". %D 2019 %R 10.4103/picr.PICR_35_19 %X In analytical observational studies, researchers try to establish an association between exposure(s) and outcome(s). Depending on the direction of enquiry, these studies can be directed forwards (cohort studies) or backwards (case¨Ccontrol studies). In this article, we examine the key features of these two types of studies %K Case¨Ccontrol study %K cohort study %K epidemiologic methods %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6463505/