Inappropriate groups were used to calculate relative risk

doi:10.1136/bmj.311.7013.1166b

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Victoria Wilson,
Dorothy Gregson,
Edward Smyth

Vocational trainee in general practice Senior registrar in public health medicine Senior registrar in public health medicine East Norfolk Health Commission, Public Health and Healthcare Directorate, Norwich NR7 0HT

EDITOR,--The effect of consumption of alcohol on mortality is an issue with a high profile, andquestions about it are often asked in general practice. In their study Morten Gronbaek and colleagues compared the relative risks for wine drinkers by using those who never drank wine as the reference group1; …