lecture 9 - Lecture Goals Lecture 9 Introduction to Study...

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1 Lecture 9 Introduction to Study Designs Lecture Goals o Discuss the goals of descriptive and analytic epidemiology o Identify descriptive and analytic study designs o Describe factors to consider when designing a study Classes of Study Designs o Descriptive studies – describe the characteristics of a disease or outcome o Analytic studies – describe the associations between risk factors and disease Descriptive Studies o Describe the distribution of disease o Generate hypotheses o Do not show cause! Types of Descriptive Studies o Case-reports – describe individual occurrences of disease o Cross-sectional studies – measure prevalence and show relationships between risk factors and disease o Ecological studies – measure correlations and trends using group data; they cannot be used to assess individual risk o To do this is to commit ecological fallacy Analytic Epidemiology Premise: o Disease does not occur randomly o There are discernable patterns that reflect the underlying etiology of disease
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