Doubts about effectiveness of age adjustment

doi:10.1136/bmj.327.7413.502-b

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Eugene Milne, deputy medical director (eugene.milne@ntwha.nhs.uk)

Northumberland and Tyne and Wear Strategic Health Authority, Newcastle General Hospital, Newcastle upon Tyne NE4 6BE

Editor–According to Enstrom and Kabat's figures the greater had been a man's cigarette consumption in 1959 the less likely, it seems, was the death of his wife from coronary heart disease.1 However, an age bias existed in those women at the outset. In 1959 their mean age decreased with spousal smoking, such that the wives of men smoking 40 a …