Boolean Operators
Use AND to connect keywords and refine your search (retrieves sources with both terms)
Use OR to connect keywords and broaden your search (retrieves sources with either term)
Use NOT to exclude a word (e.g., heart attack NOT stroke)
Use quotation marks to retrieve sources with a phrase in the exact order typed e.g., "rural health"
Nesting Search Terms
Place parentheses around terms connected with the Or operator. Nesting words within parentheses tells the database to process the words as part of the overall search. The absence of parentheses around groups of synonyms and similar concepts disconnects the words from the search equation, and searches for the words separately.
headache AND tylenol OR motrin |
Searches for publications with headache and tylenol, and items with motrin
|
headache AND (tylenol OR motrin) |
Searches for publications with headache and tylenol, and publications with headache and motrin
|
PubMed & MeSH
MeSH (Medical Subject Headings) is the National Library of Medicine's (NLM) controlled vocabulary. NLM is the producer of MEDLINE, which is the primary component of PubMed. MeSH terms are assigned to articles based on content. MeSH terms help target a search by:
Clarifying context (topical and grammatical)
Capturing synonyms and related terms
Use the MeSH Database to search for terms.
Recommended Resources for EBM Publications
In most cases, resource content overlaps and publications can be found across resources. This table maps evidence types to resources focused on particular types of evidence.
Evidence Type |
Recommended Resource |
Clinical Practice Guidelines |
UpToDate, Access Medicine, ClinicalKey, Professional Organizations (AAFP, AHRQ, NIH, etc.) |
Systematic Reviews & Meta-Analysis |
Cochrane Library, PubMed Clinical Queries, TRIP Database |
Critically Appraised Topics |
UpToDate, ClinicalKey, Access Medicine |
Primary Research Articles |
MEDLINE, PubMed, CINAHL |
Research Parameters
Inclusion and exclusion criteria are required for systematic reviews but can also be used for standard reviews. In purpose, inclusion and exclusion criteria focus the scope of the research and mitigate bias. Inclusion criteria are factors a study must have to be included in a review. Exclusion criteria are factors that make a study ineligible to be included in a review.
Criteria can include:
Newton Gresham Library | (936) 294-1614 | (866) NGL-INFO | Ask a Question | Share a Suggestion
Sam Houston State University | Huntsville, Texas 77341 | (936) 294-1111 | (866) BEARKAT
© Copyright Sam Houston State University | All rights reserved. | A Member of The Texas State University System