http://www.btny.purdue.edu/Pubs/PPP/PPP-43.pdf

It's intented to provide an understanding of a few basic epidemiological concepts and methods that help to comprehend epidemiological findings cited in scientific journals, media accounts, public advocacy group releases, and government documents. It presents the following parts: - The science of Epidemiology; - Principles of Epidemiology; - Sources of information; - Epidemiology as an observational science; - Study designs in Epidemiology; - Reporting epidemiological data; - Bias complicates study results; - Placing epidemiological studies in perspectives; and Conclusion. The plug-in Adobe Acrobat Reader is required to read this publication.