Number needed to treat: Difference between revisions
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imported>Robert Badgett (New page: The '''number needed to treat''' is a way of summarizing the benefit of an intervention to improve health care.<ref name="pmid3374545">{{cite journal |author=Laupacis A, Sackett DL, Robert...) |
imported>Robert Badgett m (→Event rates) |
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:<math>\mbox{Experimental event rate}=\left (\frac{\mbox{Cell A}}{\mbox{Cell A + Cell B}}\right )</math> | :<math>\mbox{Experimental event rate}=\left (\frac{\mbox{Cell A}}{\mbox{Cell A + Cell B}}\right )</math> | ||
:<math>\mbox{Control event rate}=\left (\frac{\mbox{Cell C}}{\mbox{Cell C + | :<math>\mbox{Control event rate}=\left (\frac{\mbox{Cell C}}{\mbox{Cell C + Cell D}}\right )</math> | ||
===Measures of efficacy=== | ===Measures of efficacy=== | ||
Revision as of 08:13, 9 December 2007
The number needed to treat is a way of summarizing the benefit of an intervention to improve health care.[1] The calculations are derived from the results of a randomized controlled trial of an intervention.
| Outcome | ||||
|---|---|---|---|---|
| Present | Absent | |||
| Intervention | Intervention group | Cell A | Cell B | Total in intervention group |
| Control group | Cell C | Cell D | Total in control group | |
| Total with outcome | Total without outcome | |||
Calculations
Event rates
Measures of efficacy
Example
References
- ↑ Laupacis A, Sackett DL, Roberts RS (1988). "An assessment of clinically useful measures of the consequences of treatment". N. Engl. J. Med. 318 (26): 1728–33. PMID 3374545. [e]