How are adverse events incorporated into economic evaluations?

• A. By assigning costs and disutilities to adverse events and including them in total costs and outcomes.
• B. By ignoring adverse events in the model.
• C. By reporting only qualitative impressions.
• D. By adjusting the discount rate.

Answer: (A)

Adverse events are valued in economic evaluations by attaching both a cost and a disutility (a negative impact on quality of life) to each event and then incorporating those into the model’s total costs and total health outcomes. In practice, the model assigns probabilities to adverse events for each treatment, adds the extra treatment or management costs those events generate, and reduces the utility values for the periods those events affect. This way, the impact of adverse events is reflected in both the cost side and the effectiveness side (often via QALYs), shaping the incremental cost-effectiveness results. For example, a drug with a certain chance of a painful rash would include the cost of treating the rash and a drop in utility during the rash period, affecting the overall cost and QALY calculations. Ignoring adverse events, reporting only qualitative impressions, or changing the discount rate does not directly capture these impacts on costs and outcomes.