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 1946 – Daily (Tues – Sun) Ovid Medline Depends

5. What happens when you type frozen shoulder

6. 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

7. What happens when you type frozen shoulder*

8. 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

9. What happens when you type “frozen shoulder”

10. 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

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

12. 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

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.Brain-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.Finasteride inhibits 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