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Int. J. Environ. Res. Public Health 2010, 7(1), 325-332; doi:10.3390/ijerph7010325

To Match or Not to Match in Epidemiological Studies—Same Outcome but Less Power

*  and
Department of Medical and Health Sciences, Community Medicine, Linköping University, SE-58183 Linköping, Sweden
* Author to whom correspondence should be addressed.
Received: 8 December 2009 / Accepted: 22 January 2010 / Published: 26 January 2010
(This article belongs to the Special Issue Advances in Epidemiology)
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This study aimed to analyze the possible resemblance or difference in outcome in a case-control study of quality of life for IBS patients compared to controls free from the disease, when a matching procedure for age and sex was applied for the control group compared to when all participating subjects were included in the control group. The main result was that almost the same and identical results were found irrespective of whether matching or not matching was applied in this epidemiological case-control study. The matching procedure however, slightly diminished the statistical power of the results.
Keywords: epidemiology; matching; case-control study; gender epidemiology; matching; case-control study; gender
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Faresjö, T.; Faresjö, Å. To Match or Not to Match in Epidemiological Studies—Same Outcome but Less Power. Int. J. Environ. Res. Public Health 2010, 7, 325-332.

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