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Serum lipids in Canadian physicians.

To the editor: In the article "Serum cholesterol and triglyceride measurements in Canadian physicians" (Can Med Assoc J 112: 447, 1975) results were based on 2071 physicians who had volunteered to be tested at 17 medical meetings over a 5-year period. In their discussion the authors state "we did not exclude physicians who volunteered for study at more than one of the meetings". Does this mean that the figure 2071 refers to the total number of blood samples obtained rather than to the number of individuals involved? If so, since some individuals may have been tested two, three or more times, can the authors tell us how many individuals were actually tested and what were the means, percentages, etc. when calculated on the basis of persons rather than samples?