Number needed to treat: difference between revisions
Diff·revision 4 → 5·06:23, 12 Nov 2024
Difference between revision 4 and revision 5 of Number needed to treat. 3 lines changed; the page grew by 296 bytes.
| Revision 4 — 00:04, 27 Oct 2024 StudentSindhu (talk) expand §Number needed to harm 1,984 bytes +234 | Revision 5 — 06:23, 12 Nov 2024 ForestPlotFinn (talk) copyedit 2,280 bytes +296 | ||
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| 11 | Its value is that it expresses effect on an absolute scale. A relative risk reduction of 20% describes a large benefit where the baseline risk is high and a negligible one where it is low; the number needed to treat carries the baseline risk within it.{{r|laupacis1988}} | 11 | Its value is that it expresses effect on an absolute scale. A relative risk reduction of 20% describes a large benefit where the baseline risk is high and a negligible one where it is low; the number needed to treat carries the baseline risk within it.{{r|laupacis1988}} |
| 12 | 12 | ||
| + | 13 | It is meaningless without a time horizon. A treatment with a number needed to treat of 50 over one year and one of 50 over five years are very different propositions, and quoting the figure without the period is the commonest error made with it.{{r|laupacis1988}} | |
| + | 14 | ||
| 13 | == Calculation == | 15 | == Calculation == |
| 14 | {{math|\text{NNT} = 1 / (\text{risk}_{\text{control}} - \text{risk}_{\text{treated}})}} | 16 | {{math|\text{NNT} = 1 / (\text{risk}_{\text{control}} - \text{risk}_{\text{treated}})}} |
| ⋮ | ⋮ | ||
| 26 | [[Category:Research methodology]] | 28 | [[Category:Research methodology]] |
| 27 | [[Category:Evidence appraisal]] | 29 | [[Category:Evidence appraisal]] |
| + | 30 | [[Category:Clinical evidence]] | |
| 28 | 31 |