Number needed to screen: Difference between revisions
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The '''number needed to screen''' is a way of summarizing the benefit of a [[mass screening|screening program]] in health care.<ref name="pmid9685274">{{cite journal |author=Rembold CM |title=Number needed to screen: development of a statistic for disease screening |journal=BMJ |volume=317 |issue=7154 |pages=307–12 |year=1998 |pmid=9685274 |doi= |issn=|url=http://www.bmj.com/cgi/content/full/317/7154/307}}</ref> The calculations are derived from the results of a [[randomized controlled trial]] of a screening program. | The '''number needed to screen''' is a way of summarizing the benefit of a [[mass screening|screening program]] in health care.<ref name="pmid9685274">{{cite journal |author=Rembold CM |title=Number needed to screen: development of a statistic for disease screening |journal=BMJ |volume=317 |issue=7154 |pages=307–12 |year=1998 |pmid=9685274 |doi= |issn=|url=http://www.bmj.com/cgi/content/full/317/7154/307}}</ref> The calculations are derived from the results of a [[randomized controlled trial]] of a screening program. | ||
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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=== | ||
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==See also== | ==See also== | ||
[[Mass screening]] | [[Mass screening]] | ||
Latest revision as of 01:35, 22 December 2007
The number needed to screen is a way of summarizing the benefit of a screening program in health care.[1] The calculations are derived from the results of a randomized controlled trial of a screening program.
| Outcome | ||||
|---|---|---|---|---|
| Present | Absent | |||
| Screening | Screen group | Cell A | Cell B | Total in screening 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
- ↑ Rembold CM (1998). "Number needed to screen: development of a statistic for disease screening". BMJ 317 (7154): 307–12. PMID 9685274. [e]