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The Systematic Literature Search

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This 2009 presentation contains general information on the systematic literature search.

Published in: Health & Medicine, Technology
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The Systematic Literature Search

  1. 1. The Systematic Literature Search Andrea Chapman Workshop Systematic Reviews March 11, 2009
  2. 2. Overview <ul><li>Introduction </li></ul><ul><li>Search Strategy </li></ul><ul><li>Conduct the Search </li></ul><ul><li>Collect and Manage the Results </li></ul>
  3. 3. The Systematic Literature Search <ul><li>a systematic approach to find as many relevant studies as possible </li></ul><ul><li>to minimize bias </li></ul><ul><li>thorough, objective and reproducible </li></ul><ul><li>conducted in several phases, using various sources </li></ul>
  4. 4. The Primary Search <ul><li>online databases </li></ul>general specific
  5. 5. Further Phases <ul><li>grey literature search </li></ul><ul><li>manual literature search </li></ul>
  6. 6. Search Steps clinical / PICOTS question search strategy search databases collect results
  7. 7. Adjusting the Question clinical / PICOTS question search strategy search databases collect results
  8. 8. PICOTS <ul><li>P opulation </li></ul><ul><li>I ntervention </li></ul><ul><li>C omparison </li></ul><ul><li>O utcome </li></ul><ul><li>T ime </li></ul><ul><li>S etting </li></ul>
  9. 9. Example Question <ul><li>Should you give patients with </li></ul><ul><li>periodontal disease doxycycline </li></ul><ul><li>to decrease gum bleeding? </li></ul>
  10. 10. Example Question <ul><li>P patients with periodontal disease </li></ul><ul><li>I doxycycline </li></ul><ul><li>C none </li></ul><ul><li>O decrease in gum bleeding </li></ul><ul><li>T none </li></ul><ul><li>S none </li></ul>
  11. 11. Developing the Search Strategy clinical / PICOTS question search strategy search databases collect results
  12. 12. Boolean Logic <ul><li>AND includes all the search terms </li></ul><ul><li>OR includes at least one of the search terms </li></ul><ul><li>NOT excludes the term from search result </li></ul>
  13. 13. Boolean Logic <ul><li>gum AND bleeding gum bleeding </li></ul><ul><li>2090 </li></ul><ul><li>gum OR bleeding </li></ul><ul><li>290109 </li></ul><ul><li>gum NOT bleeding </li></ul><ul><li>7281 </li></ul>
  14. 14. Combing Terms <ul><li>gum bleeding AND periodontal disease </li></ul><ul><li>1924 </li></ul><ul><li>gum bleeding AND (periodontal disease OR oral hemorrhage) </li></ul><ul><li>1956 </li></ul><ul><li>gum bleeding AND periodontal disease OR oral hemorrhage </li></ul><ul><li>7678 </li></ul>
  15. 15. Special Characters <ul><li>“ ” </li></ul><ul><li>“ gum bleeding” </li></ul><ul><li>searches exact phrase </li></ul><ul><li>* </li></ul><ul><li>diseas* </li></ul><ul><li>searches disease, diseases, etc. </li></ul>
  16. 16. Basic Search String <ul><li>P patients with periodontal disease </li></ul><ul><li>I doxycycline </li></ul><ul><li>C none </li></ul><ul><li>O decrease in gum bleeding </li></ul><ul><li>T none </li></ul><ul><li>S none </li></ul><ul><li>gum bleeding AND periodontal disease AND doxycycline </li></ul>
  17. 17. Expanding the Basic Search <ul><li>gum bleeding AND periodontal disease AND doxycycline </li></ul>other ? other ? other ?
  18. 18. Expanding the Basic Search <ul><li>“ gum bleeding” AND periodontal diseas* AND (doxycycline OR vibramycin) </li></ul>
  19. 19. clinical / PICOTS question search strategy search databases collect results
  20. 20. Searching Pubmed
  21. 21. PubMed and the Search Strategy search strategy search PubMed
  22. 22. PubMed Search <ul><li>gum bleeding AND doxycycline </li></ul>
  23. 23. PubMed Features <ul><li>Go </li></ul><ul><li>History </li></ul><ul><li>Combining </li></ul><ul><li>Limits </li></ul>
  24. 24. Enter the search term and press Go .
  25. 25. <ul><li>Drug search </li></ul>Search a second term.
  26. 26. View the History
  27. 27. Combine searches using number in the History. doxycycline
  28. 28. Limit searches.
  29. 29. Limits <ul><li>Publication Date </li></ul><ul><li>Human or Animal </li></ul><ul><li>Male or Female </li></ul><ul><li>Languages </li></ul><ul><li>Publication Type </li></ul><ul><li>Ages </li></ul>
  30. 30. Result!
  31. 31. clinical / PICOTS question search strategy search databases collect results
  32. 32. Can We Do Better? <ul><li>“ gum bleeding” AND periodontal diseas* AND (doxycycline OR vibramycin) </li></ul>MeSH term ? MeSH term ? MeSH term ?
  33. 33. MeSH - Medical Subject Headings <ul><li>describe the subject of an article </li></ul><ul><li>controlled vocabulary thesaurus used for indexing articles (a classification system) </li></ul><ul><li>MeSH terminology provides a consistent way to retrieve information that may use different terminology for the same concept. </li></ul>
  34. 34. Example MeSH term <ul><li>The MeSH term for gum bleeding is Gingival Hemorrhage. </li></ul>
  35. 35. MeSH in PubMed MeSH Gingival Hemorrhage is under MeSH Periodontal Disease! hierarchy broader terms above specific terms
  36. 36. MeSH in PubMed Medications can also be a MeSH term.
  37. 37. Example MeSH term <ul><li>“ gum bleeding” AND periodontal diseas* AND (doxycycline OR vibramycin) </li></ul>Use MeSH term Use MeSH term Use free text Unnecessary ?
  38. 38. Access the MeSH database from PubMed.
  39. 39. MeSH Features <ul><li>Subheadings </li></ul><ul><li>Major Topic </li></ul><ul><li>Do Not Explode </li></ul><ul><li>Search Box </li></ul>
  40. 40.
  41. 41. Send MeSH term to search box.
  42. 42. The MeSH term is now in the search box.
  43. 43. When more than one MeSH term is found. Double click.
  44. 44.
  45. 45.
  46. 46.
  47. 47.
  48. 48.
  49. 49. Complete Search String <ul><li>&quot;Gingival Hemorrhage&quot;[Mesh] AND ( &quot;Doxycycline&quot;[Mesh] OR vibramycin) </li></ul>
  50. 50.
  51. 51. Complete Search String <ul><li>(&quot;Periodontal Diseases&quot;[Mesh] OR parodontos*) AND (&quot;Doxycycline&quot;[Mesh] OR vibramycin) AND (&quot;Gingival Hemorrhage&quot;[Mesh] OR &quot;gum bleeding&quot;) </li></ul>(&quot;Periodontal Diseases&quot;[Mesh] OR parodontos*) AND (&quot;Doxycycline&quot;[Mesh] OR vibramycin) AND (&quot;Gingival Hemorrhage&quot;[Mesh] OR &quot;gum bleeding&quot;) (&quot;Periodontal Diseases&quot;[Mesh] OR parodontos*) AND (&quot;Doxycycline&quot;[Mesh] OR vibramycin) AND (&quot;Gingival Hemorrhage&quot;[Mesh] OR &quot; gum bleeding &quot; )
  52. 52.
  53. 53. PubMed - Additional Features <ul><li>Details </li></ul><ul><li>Clear </li></ul><ul><li>Export Results </li></ul>
  54. 54. Click Details to see how Pubmed interpreted results
  55. 55. Pubmed mapped gum bleeding to the MeSH term gingival hemorrhage
  56. 56. Clear searches.
  57. 57. To Export go into Result
  58. 58.
  59. 59.
  60. 60.
  61. 61. www.pubmed.com
  62. 62. Searching Cochrane <ul><li>Advance Search </li></ul><ul><li>MeSH Search </li></ul><ul><li>Search History </li></ul><ul><li>Restrict by Product </li></ul><ul><li>Date Range </li></ul>
  63. 63. www.thecochranelibrary.com
  64. 64. Document the Search Strategy <ul><li>project name </li></ul><ul><li>search date </li></ul><ul><li>copy the search history for each database </li></ul>
  65. 65. clinical / PICOTS question search strategy search databases collect results
  66. 66. EndNote <ul><li>Creating a New Library </li></ul><ul><li>Importing Search Results </li></ul><ul><li>Changing Field Content </li></ul><ul><li>Rename Field Headings </li></ul><ul><li>Sorting </li></ul><ul><li>Output Style </li></ul><ul><li>Print Preview </li></ul>
  67. 67.
  68. 68. Importing
  69. 69. Importing
  70. 70. Change Field Content
  71. 71.
  72. 72.
  73. 73. Rename Field Headings

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