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Why do I get different results ?

Why do I get different results ?. Terry Ann Jankowski, MLS, AHIP Head, User Experience Health Sciences Library University of Washington. Short Answer. Different d atabases Term selection. Different Databases. Coverage Years covered Journals & publication types Update schedule

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Why do I get different results ?

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  1. Why do I get different results ? Terry Ann Jankowski, MLS, AHIP Head, User Experience Health Sciences Library University of Washington

  2. Short Answer • Different databases • Term selection

  3. Different Databases • Coverage • Years covered • Journals & publication types • Update schedule • Structure • Default fields • Default operations

  4. Coverage NLM PubMed/Medline Ovid Medline Depends Depends • 1946 – • Daily (Tues – Sun)

  5. What happens when you type frozen shoulder

  6. NLM Ovid “mp” – default fields No term mapping No explosion Words searched as a phrase • “All fields” • Automatic term mapping to MeSH • Automatic explosion of MeSH terms • Words “anded”

  7. What happens when you type frozen shoulder*

  8. NLM Ovid “mp” – default fields No term mapping No explosion of MeSH Words searched as phrase • “All fields” • No term mapping to MeSH • No explosion of MeSH terms • Words searched as phrase

  9. What happens when you type “frozen shoulder”

  10. NLM Ovid “mp” – default fields No term mapping No explosion of MeSH Words searched as phrase • Phrase index searched • No explosion of MeSH terms • Words searched as phrase (may or may not be “anded”)

  11. You can control results by • Getting to know your database • Using qualifiers • Term selection

  12. What terms to use? Natural language Controlled Vocabulary More comprehensive? Concepts not words Pre-coordination • Quick & dirty searching • New words, brand names, phrases • Concepts not indexed

  13. Indexing Principles • Entire article • Avg 10 – 15/20 • Major vs minor • Use most specific term or closest match – Rule of 3 • Drugs – generic (USAN) • Techniques, methods & geography – minor only • Neoplasms - site & histological type • Specialty terms

  14. Indexing Rules of Thumb • Pre-coordinated • Heading/sub heading combination(s) • 2 or more unrelated terms

  15. Warning • Inconsistency in indexing

  16. Question • What is the effect of estrogen and progesterone on the brain, particularly in regards to epilepsy?

  17. Natural Language Strategy Brain AND (estrogen OR progesterone) AND (epilepsy OR seizures)

  18. Controlled Vocabulary Search (brain/de OR brain/ci) AND (estrogens OR progesterone) AND (epilepsy/ci OR epilepsy/ci)

  19. Compare Brain-derived neurotrophic factor-estrogen interactions in the hippocampal mossy fiber pathway: Implications for normal brain function and disease. PMID: 23276673 [PubMed - in process] Finasterideinhibits the disease-modifying activity of progesterone in the hippocampus kindling model of epileptogenesis. PMID: 22835430 [PubMed - indexed for MEDLINE]

  20. Which will you use?

  21. Final Thoughts • Experiment to find the best search • Use the database structure and features to your advantage • KNOW YOUR DATABASE

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