HP_200_Intro_to_Epi_Lecture

HP_200_Intro_to_Epi_Lecture - What is Epidemiology Topics...

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1 What is What is Epidemiology? Epidemiology? HP 200 August 29, 2006 Topics to be Covered Topics to be Covered Define Epidemiology Rates: Incidence vs. Prevalence Odds Ratios Types of Studies Types of Bias Epidemiology Epidemiology Epi = upon Demos = people Epidemiology is the Epidemiology is the study of the patterns of study of the patterns of disease in human disease in human populations populations Who has the disease? How much disease do they have? Why do they have the disease?
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2 The Focus of Epidemiology While clinical studies aimed at understanding the causes of disease focus on sick individuals , epidemiologic studies focus on populations that include healthy as well as sick persons The Focus of Epidemiology The Focus of Epidemiology Physicians = uniqueness of each patient Epidemiologists = common and general about members of populations The Focus of Epidemiology The Focus of Epidemiology Therefore, most epidemiological studies are field studies Epidemiological studies also focus on person, place, and time Premises of Epidemiology Human disease is related to man’s environment Inter-relation of factors -Epidemiologic Triangle -Web of Causation -The Wheel
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3 Epidemiologic Triangle Epidemiologic Triangle (Triad) (Triad) Host Host Vector Vector Agent Environment Epidemiologic Triad Epidemiologic Triad Host – Individual who is afflicted Agent – Cause of illness (microbe, radiation,chemical) Vector – Carrier of the agent Environment – Where all of the above takes place Wheel of Causation Wheel of Causation Disease Causes Causes Causes Causes Causes Causes Causes Causes Causes Causes Web of Causation Web of Causation Disease Disease Causes Causes Causes Causes Causes Causes Causes Causes Causes Causes Causes Causes Causes Disease Disease Disease
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4 Premises of Epidemiology Premises of Epidemiology Multiple causation of disease –Host factors (intrinsic): genetic characteristics, specific immunities, personality traits –Environmental factors (extrinsic): biologic
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