why do i get different results ? terry ann jankowski, mls, ahip head, user experience health...
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Why do I get different results ?
Terry Ann Jankowski, MLS, AHIPHead, User ExperienceHealth Sciences Library
University of Washington
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Short Answer• Different databases• Term selection
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Different Databases• Coverage– Years covered– Journals & publication types– Update schedule
• Structure– Default fields– Default operations
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CoverageNLM PubMed/Medline• 1946 –• Daily (Tues – Sun)
Ovid Medline• Depends • Depends
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What happens when you type
frozen shoulder
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NLM• “All fields”• Automatic term mapping to
MeSH• Automatic explosion of
MeSH terms• Words “anded”
Ovid• “mp” – default fields• No term mapping• No explosion • Words searched as a phrase
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What happens when you type
frozen shoulder*
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NLM• “All fields”• No term mapping to MeSH• No explosion of MeSH
terms• Words searched as phrase
Ovid• “mp” – default fields• No term mapping• No explosion of MeSH• Words searched as phrase
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What happens when you type
“frozen shoulder”
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NLM• Phrase index searched• No explosion of MeSH
terms• Words searched as phrase
(may or may not be “anded”)
Ovid• “mp” – default fields• No term mapping• No explosion of MeSH• Words searched as phrase
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You can control results by• Getting to know your database• Using qualifiers• Term selection
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What terms to use?Natural language• Quick & dirty searching• New words, brand names,
phrases• Concepts not indexed
Controlled Vocabulary• More comprehensive?• Concepts not words• Pre-coordination
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Indexing PrinciplesEntire articleAvg 10 – 15/20Major vs minorUse most specific term or closest match – Rule of 3Drugs – generic (USAN)Techniques, methods & geography – minor onlyNeoplasms - site & histological typeSpecialty terms
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Indexing Rules of Thumb• Pre-coordinated• Heading/sub heading combination(s)• 2 or more unrelated terms
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Warning• Inconsistency in indexing
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Question
• What is the effect of estrogen and progesterone on the brain, particularly in regards to epilepsy?
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Natural Language Strategy
Brain AND (estrogen OR progesterone) AND (epilepsy OR seizures)
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Controlled Vocabulary Search(brain/de OR brain/ci) AND (estrogens OR progesterone) AND (epilepsy/ci OR epilepsy/ci)
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CompareBrain-derived neurotrophic factor-estrogen interactions in the hippocampal mossy fiber pathway: Implications for normal brain function and disease. PMID: 23276673 [PubMed - in process] Finasteride inhibits the disease-modifying activity of progesterone in the hippocampus kindling model of epileptogenesis. PMID: 22835430 [PubMed - indexed for MEDLINE]
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Which will you use?
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Final Thoughts• Experiment to find the best search• Use the database structure and features to
your advantage• KNOW YOUR DATABASE