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 Vol. 14 No. 5, November 2005
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AAP Grand Rounds 14:50 (2005)
© 2005 American Academy of Pediatrics

WEIGHING THE EVIDENCE

Weighing the Evidence: Power Calculations

James A. Taylor, MD, FAAP
The first 20% of the full text of this article appears below.

When comparing the efficacy of 2 treatments in a clinical trial, 4 outcomes are possible: 1) the study detected a "true" difference; 2) the study found a difference, but there is no "true" difference; 3) the study found no difference, and there is none; and 4) the study demonstrated no difference, but there is a "true" difference. Calculation of the "power" of a study can help determine which of these outcomes is . . . [Full Text of this Article]






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