Explain the difference between magnitude and severity in risk assessment for health promotion.

• A. Magnitude is seriousness; severity is prevalence.
• B. Both refer to prevalence; negligible difference.
• C. Magnitude is cost impact; severity is time to onset.
• D. Magnitude is how widespread or prevalent a risk is in the population; severity is the seriousness of outcomes if the risk materializes.

Answer: (D)

The main idea is distinguishing how common a risk is versus how bad the consequences would be. Magnitude describes how widespread or prevalent a risk is in the population—the extent of exposure or how many people are affected. Severity describes how serious the outcomes would be if the risk occurs—the potential impact on health, disability, or death. In health-promotion risk assessment, this helps you prioritize because a risk that is very common affects many people and calls for broad prevention, while a risk with very serious outcomes demands strong protective measures even if it’s less common. The other options mix up these concepts: magnitude isn’t about cost and prevalence isn’t the sole aspect of severity, and time to onset doesn’t define severity.