Review for Midterm #1: Rate Adjustment Practice Problems Answer Key

Review for Midterm #1: Rate Adjustment Practice Problems Answer Key

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EPI420 Midterm Review, Spring 2008 Part 1 1. What is the crude prevalence of MS among people of different ethnicities in Seattle and San Diego? San Diego=(1800/1,267,000)*1000= 1.42 MS cases per 1000 people Seattle=(905/570,000)*1000= 1.59 MS cases per 1000 people 2. What is the exposure, outcome, and confounder? Exposure=City Outcome=MS Confounder=Race 3. Why does the crude prevalence differ if the prevalences of MS within racial groups in the two cities are the same? The prevalence of MS is higher in white race groups and there are proportionately more white people in Seattle (399,000/570,000)*100=70.0% than San Diego (763,000/1,267,000)*100=60.2%. 4. Use a standard population by combining the populations of San Diego and Seattle and calculate the adjusted prevalence for each city. Std Population White=763,000+399,000=1,162,000 African-American=100,000+48,000=148,000 Asian=172,000+75,000=247,000 Other=232,000+48,000=280,000 Race Specific Rates San Diego Seattle White 2 cases per 1000 people
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Review for Midterm #1: Rate Adjustment Practice Problems Answer Key

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