Letters
Matching in case-control studies
BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6975.329d (Published 04 February 1995) Cite this as: BMJ 1995;310:329
- Henrik Toft Sorensen,
- Matthew W Gillman
- Associate professor Danish Epidemiology Science Centre, University of Aarhus, 8000 Aarhus C, Denmark
- Assistant professor Department of Ambulatory Care and Prevention, Harvard Medical School and Harvard Community Health Plan, 126 Brookline Avenue, Boston, MA 02215, USA
EDITOR,—J Martin Bland and Douglas G Altman's review of the advantages and disadvantages of matching in case-control studies omits two important problems.1
Firstly, matching in case-control studies ensures that the matching factors, such as age or sex, are equally distributed between cases and controls. …