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- Boolean operators AND, OR and NOT must be entered in UPPERCASE.
- AND is the default operator used in PubMed. If you do not include Boolean operators in your search, PubMed will automatically use AND between terms.
- PubMed processes
Boolean connectors left-to-right.
- You can change
the order of processing by nesting an individual concept in parentheses. The terms
inside the parentheses will be processed as a unit and then incorporated
into the overall strategy. [Show Me]
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Last reviewed: 3 April 2013
Last updated: 7 February 2013
First published: 20 March 2001
Metadata| Permanence level: Permanent: Dynamic Content