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Decimal Format.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0018
Item type: 
section
The decimal format is recommended for numbers used with units of measure. Fractions should not be used with SI units. Mixed fractions occasionally are used in text to indicate less precise measurements and most commonly involve units of measure that represent time. After more than 7½ years of investigation, the effort to develop a new vaccine was abandoned....

Expressing Quantities.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0017
Item type: 
section
Arabic numerals are used for quantities with units of measure (see 18.1, Use of Numerals). By SI convention, it is preferable to use only numbers between 0.1 and 1000 and to use the appropriate prefix for expressing quantities. For example, 0.003 mL is expressed as 3 ...

Indexes.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0021
Item type: 
section
An index generally refers to a quantity derived from a ratio of 2 (or more) measurable quantities and often is used to compare individuals with each other or with normal values. Except for products or quotients that represent specific derived SI units of measure (...

Multiplication of Numbers.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0020
Item type: 
section
Multiplication of numbers should be indicated by the multiplication sign (×) and may be used to express area (eg, a 15 × 35-cm2 burn), volume (eg, a 5.2 × 3.7 × 6.9-m3 cube), matrixes (eg, a 2 × 2 table), magnification (×30 000), or scientific notation (eg, 3.6 × 10...

Number Spacing.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0019
Item type: 
section
By SI convention, the decimal point is the only punctuation mark permitted in numerals, and it is used to separate the integer and decimal parts of the number. The SI does not use commas in numbers in particular because the comma is used in some countries as the decimal sign. Integers (whole numbers) with more than 4 digits are separated into groups of 3 (using a thin space, a space character that is usually 1⁄5 or 1⁄6 the width of an em dash; to insert a thin space using Unicode in Microsoft Word, type the code 2009 where the thin space should appear, set the cursor after “9,” and press Alt + X on the keyboard) with respect to the decimal point. Four-digit integers are closed up (without a space). Decimal digits also are grouped in sets of 3 digits beginning at the decimal sign, with the same closed-up spacing for 4-digit groups (...

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