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BMJ 1996; 312 doi: (Published 15 June 1996) Cite this as: BMJ 1996;312:0

Case mix, impotence, a Swedish king, and junior doctors' shoesYou open a stroke unit and increase by 50% the chance of patients living at home 12 months after a stroke. How happy you are. But if you have any knowledge you will know to adjust for the age and sex of the patients. Luckily, the difference is still statistically significant. But you also need to adjust for “case mix”-the possibility that one set of patients may be sicker than the other. when you do, the …

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