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Previous Volume 337:708-709 September 4, 1997 Number 10 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: We wish to underscore Dr. McTiernan's cautionary comments in her editorial on the potential bias in the study of physical activity and the risk of breast cancer by Thune et al. (May 1 issue),^1,2 since we find serious flaws in the analysis presented.

Our main objection is that the women studied were not classified according to total amount of physical activity, both during leisure time and at work. Therefore, no dose–response relation can be inferred between a woman's total physical activity and her risk of cancer. It is possible, for example, that some of the 66 women . . . [Full Text of this Article]

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