Transcription of Epidemiologic study designs
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Epidemiologic study designs
8. Analytic study designs The architecture of the various strategies for testing hypotheses through Epidemiologic studies , a comparison of their relative strengths and weaknesses, and an in-depth investigation of major designs . Epidemiologic study designs In previous topics we investigated issues in defining disease and other health-related outcomes, in quantitating disease occurrence in populations, in relating disease rates to factors of interest, and in exploring and monitoring disease rates and relationships in populations. We have referred to cohort studies , cross-sectional, and case-control studies as the sources of the measures we examined, but the study designs themselves were secondary to our interest. In the present chapter we will define and compare various study designs and their usefulness for investigating relationships between an outcome and an exposure or study factor. We will then examine two designs intervention trials and case-control studies in greater depth.
Descriptive studies and surveillance An alternate stimulus to investigation may come from a surveillance activity or descriptive study. The descriptive study might be a re-analysis of data collected for some other purpose (e.g., from a national population survey or possibly from an analytic study of another hypothesis or even another
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