To the Editor: The Precursors Study is an extraordinarily farsighted effort. Nonetheless, the study of coffee consumption and heart disease reported in the Journal (Oct. 16 issue)* is guilty of the same error that the authors observed in other investigations — using data obtained at a time remote from the coronary event. The Precursors Study measured cholesterol levels only at base line, many years before the end-point events. No dietary data other than coffee consumption are reported. Coffee and cigarette consumption were related throughout the study, and it is reasonable to assume that the diet of people who drink coffee.
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