Percentages - 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 ( © 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: 30 November 2015

The term percent derives from the Latin per centum, meaning by the hundred, or in, to, or for every hundred. The term percent and the symbol % should be used with specific numbers. Percentage is a more general term for any number or amount that can be stated as a percent. Percentile is defined as the value on a scale of 100 that indicates the percentage of the distribution that is equal to or below it.Ten percent of the work remained to be done. Heart disease was present in a small percentage of the participants. (But: Five percent of the

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