Ordinals - AMA Manual of Style

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Numbers and Percentages

Stephen J. Lurie

and Margaret A. Winker

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PRINTED FROM AMA MANUAL OF STYLE ONLINE (www.amamanualofstyle.com). © American Medical Association, 2009. All Rights Reserved. Under the terms of the license agreement, an individual user may print out a PDF of a single chapter of a title in AMA Manual of Style Online for personal use (for details see Privacy Policy). date: 27 November 2015

Ordinal numbers generally express order or rank, rather than a precise quantity. Because they usually address nontechnical aspects of the objects they modify, ordinals are often found in literary writing. The numerical expression of commonly used ordinals (1st, 2nd, 3rd, 4th, etc) may appear jarring and interrupt the flow of the text. For this reason the ordinals first through ninth are spelled out.The third patient was not available for reevaluation. It has become second nature. The numeric form of ordinals greater than ninth is well established in literary texts (10th, 11th, and so on) except at the beginning of a

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