What is It? Why is It important?

Epidemiological Studies

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Study Design in Epidemiology
• Depends on:
– The research question and hypotheses
– Resources and time available for the study
– Type of outcome of interest
– Type of exposure of interest
– EthicsStudy Design in Epidemiology

• Includes:
– The research question and hypotheses
– Measures and data quality
– Time
– Study population
• Inclusion/exclusion criteria
• Internal/external validityEpidemiologic Study Designs
• Descriptive studies
– Seeks to measure the frequency of disease and/or
collect descriptive data on risk factors
• Analytic studies
– Tests a causal hypothesis about the etiology of disease
• Experimental studies
– Compares, for example, treatmentsCross-sectional