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Previous Volume 341:697-700 August 26, 1999 Number 9 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: In their meta-analysis of passive smoking, He et al. (March 25 issue)¹ analyzed 10 cohort and 8 case–control studies and concluded that nonsmokers exposed to environmental tobacco smoke had an overall relative risk of coronary heart disease of 1.25. I want to point out several problems with their analysis. For the cohort studies they analyzed, each adjusted relative risk shown in Figure 1 of their article is higher than the corresponding crude relative risk that can be calculated from the data given in the figure. For example, in the study by Garland et al.² the crude relative . . . [Full Text of this Article]

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