Population prevention
Compare universal and targeted approaches, considering reach, benefit, acceptability and unintended effects.
Understand
Population measures can shift risk across many people, while targeted support reaches those with greater need. Neither approach is sufficient in every context.
Assess
Compare reach, cost, acceptability, potential harms and equity. Consider whether the high-risk group can actually access the proposed service.
Apply
Choose measures with a plausible mechanism and evaluate uptake and outcome, not only the number of leaflets or appointments delivered.
Key distinctions
Universal prevention can produce large population benefit from modest individual effect, while targeted approaches can address high unmet need. A proportionate universal approach combines broad availability with greater support where need is greater. Assess unintended effects, such as stigma or access barriers, and use measures of reach and disease outcome rather than activity counts alone.
Think through a case
A population fluoride programme reaches many low-risk people while a targeted outreach service reaches fewer high-risk families. Compare effect, reach and equity rather than choosing by slogan.
The distinction to remember
Do not judge prevention only by the number of contacts or leaflets handed out.
Test your recall
Why might a population measure help even low-risk individuals?
Show answer
Small individual gains can add up across many people.