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J. Joseph Perry, MD
Heart Center of Salt Lake Salt Lake City, Utah

JAMA. 1994;271(6):426.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.

—Only occasionally do articles demonstrating no significant differences publish β statistics. In the trial by Weaver et al¹ in which there was a 30% lower mortality rate in the patients treated in a prehospital fashion compared with the control population, there was no significant difference. According to my crude estimates, a trial of this size has about a 38% chance, almost four of 10, of not detecting even a 40% reduction in mortality given the numbers of patients studied. In other words, there is more than one chance in three that the conclusion published here is inaccurate. . . . [Full Text PDF of this Article]

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