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AMA Manual of Style (10 ed.) : A Guide for Authors and Editors

AMA Manual of Style Committee

Publisher:
Oxford University Press
Print Publication Date:
Mar 2007
Print ISBN-13:
9780195176339
Published to AMA Manual of Style:
Apr 2009
DOI:
10.1093/jama/9780195176339.001.0001
© American Medical Association

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Contents

Glossary of Statistical Terms

Chapter:
Study Design and Statistics
Author(s):

Margaret A. Winker,

Stephen J. Lurie

UPDATE: Although our style manual recommends (Section 20.9, page 888 in the print) that "[expressing] P to more than 3 significant digits does not add useful information to P<.001," in certain types of studies (particularly GWAS [genome-wide association studies] and other studies in which there are adjustments for multiple comparisons, such as Bonferroni correction, and the definition of level of significance is substantially less than P<.05) it may be important to express P values to more significant digits. For example, if the threshold of significance is P<.0004, then by definition the P value must be expressed to at least 4

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