How do cost of illness studies differ from economic evaluations?

• A. Cost of illness estimates the total economic burden of a disease; economic evaluations compare costs and outcomes of alternatives
• B. Cost of illness evaluates treatment effectiveness
• C. Economic evaluations only estimate costs, not outcomes
• D. Cost of illness includes patient satisfaction

Answer: (A)

The main idea here is the purpose and what each method measures. Cost of illness studies quantify the total economic burden a disease imposes on society, tallying direct costs (like medical care), direct nonmedical costs (such as transportation or caregiver time), and indirect costs (like lost productivity). They don’t compare treatment options or look at health outcomes. Economic evaluations, on the other hand, are designed to guide decisions between alternatives by weighing both costs and health outcomes—often measuring effectiveness, quality-adjusted life years, or other benefits alongside costs. They explicitly compare different strategies to determine if additional benefits justify the extra costs. So the statement that cost of illness estimates the total economic burden and economic evaluations compare costs and outcomes of alternatives best captures the distinction. The other options misstate what each method assesses: COI isn’t about treatment effectiveness or patient satisfaction, and economic evaluations do include outcomes, not just costs.