Parenthetical Plurals - AMA Manual of Style

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Contents
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Parenthetical Plurals 

Parenthetical Plurals

Chapter:
Grammar
Author(s):

Stacy Christiansen

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Parenthetical Plurals

When -s or -es is added parenthetically to a word to express the possibility of a plural, the verb should be singular. However, in most instances it is preferable to avoid this construction and use the plural noun instead.

Acceptable:

The risk factor(s) for each study participant was not always clear.

Better:

The risk factors of the study participants were not always clear.

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