The program has also been tested and found applicable for SAS Software University Edition. This article presents a revised matching program which was generated using SAS software, Version 9.4 of the SAS System. These issues included typographical errors that prevented the execution of the code. One article described a matching program (Mounib and Satchi, 2000) however, for inexperienced SAS-users several issues hindered meaningful use of this method. Only a small number of suitable methods for matching case with controls are available using SAS software for inexperienced SAS-users. For researchers new to the SAS software (SAS Institute Inc., Cary, NC, USA), matching cases with controls may not be easily performed. Therefore, matching often reduces the risk of confounding in cohort studies (Bloom et al., 2007). In matched cohort studies, the persons with the exposure of interest are matched with unexposed persons in order to make the two groups more similar with regard to confounding variables. In case-control studies the cases with the disease of interest are matched with disease-free controls in order to retrospectively explore risk-factors. Matching of one group with specific exposures or outcome with a comparable group is frequently used in medical research to investigate the association between exposure and outcome.
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