Number needed to harm

The estimated number exposed to an intervention for one additional adverse outcome over a specified period, relative to a comparator.

Context

Evidence & provenance

Related concepts

Further reading

• PubMed search for “Number needed to harm”
• Google Scholar search for “Number needed to harm”
• When comparing findings, inspect population, design, effect size, uncertainty, selection, and whether the inference is within-person, between-person, predictive, or causal.

References

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