[1:R matched case-control studies with fixed and varying numbers of controls]

This paper introduces the use of the Mantel-Haenszel estimator in 1:R matched case-control studies with fixed and varying numbers of controls matched to each case. The new methods of variance estimator of the Mantel-Haenszel estimator of a common odds ratio were provided. These methods were also summarized into the method of calculating table in order to present a simple, convenient and easily understanding method for the readers.