planning a search strategy pico, concept boxes and boolean operators
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Planning a Planning a Search Search
StrategyStrategy
PICO, Concept Boxes and Boolean Operators
Online Searching Online Searching at a Glanceat a Glance
• Useful terminology:o Pearl Searching: find a good article aka pearl
and look at the referenceso Boolean operators: most databases allow
boolean operators to narrow or broaden a search (AND, OR, NOT)
o Truncation: most databases use symbols such as * for truncation, e.g., dent* will retrieve dental, dentistry, dentist, etc.
BOOLEANBOOLEANSEARCHINGSEARCHING
Using AND, OR, and NOT
AND
bisphosphonates AND osteonecrosis
OR
osteonecrosis OR death of bone OR bone death OR bone necrosis
osteonecrosis NOT femur head necrosis
NOT
TruncationTruncation
Using * (asterisk) and ? (question mark)
Using * to truncate retrieves any Using * to truncate retrieves any
ending after the truncated part of the ending after the truncated part of the
word.word.
• Manag* will retrieve manage, management, manager, etc.
But, be careful
Truncating too soon can be problematic
cat*cat
catshttp://www.vetprofessionals.com/catprofessional/
http://ochumanesociety.com/dogs---cats-for-adoption/available-pets/cats-and-kittens.htmhttp://www.swordsandarmor.com/mall/miniature-Catapult-Siege-Weapon.html
http://www.wisegeek.com/what-is-a-cow.htm#slideshow
catapult
cattle
? will find different spellings within a word
wom?n will retrieve woman and women
? can also be used to find British/Canadian and American spelling
gr?y cat
gr?y cat
http://blog.sureflap.com/tag/animal-shelters/http://dnakluski.files.wordpress.com/2010/10/canadian-flag.gif
http://goodamericanpost.files.wordpress.com/2010/05/american-flag1.jpg
grey cat gray cat
British and North American spellings vary. When entering textwords in search engines for international databases such as Cochrane or Medline, it is necessary to allow for the different spellings, or else some citations may be missed.Use $ or : to get all possible endings (e.g. comput:.mp. for computer, computers, computing, computed, etc.)Use # to replace exactly one character (wom#n.mp. for woman or women)Use ? to replace 0 or 1 character (labo?r.mp. for labor or labour)
Examples U.S. British In OVID, enter as:
anemia/anaemiaetiology/aetiology
gynecology/gynaecologyhemoglobin/haemoglobin
-e-
-ae-
an?emia"etiology or aetiology"gyn?ecology"hemoglobin or haemoglobin"
esophagus/oesophagusfetus/foetusdiarrhea/diarrhoea
-e-
-oe-
"esophagus or oesophagus""fetus or foetus"diarrh?ea
tumor/tumour -o- -ou- tumo?r
organize/organise -z- -s- organi#e
counseling/counsellingcounseled/counselled
-l-
-ll-
counse$ling for specific endingcounsel
sulfur/sulphur -f- -ph- sul#?ur
fiber/fibre -er-
-re- fib:
Steps to finding Steps to finding articlesarticles
• Identify the main concepts or keywords
• Determine the best resources
• Plan the search
• Document the search and cite
• Evaluate what you find
Example topicExample topicYour hospital wants to implement a policy of placing
all HIV+ patients on INH prophylaxis therapy. You have been asked to do a review to see if that is successful in preventing tuberculosis, in particular in other African countries.
Identify the main Identify the main conceptsconcepts
• The easiest way to make your question searchable is to break it up into concepts
• For each concept, think of as many keywords/synonyms as you can
• A very popular method to use is PICO
Identify the main Identify the main conceptsconcepts
• PICO Method
P – Population I – InterventionC – Comparison (Optional)O – Outcome
PICO Example ContinuedPICO Example Continued• P – HIV positive in African countries• I – INH prophylaxis therapy• C – n/a• O – decreased rates of tuberculosis
Answerable Question: In African countries does INH prophylaxis therapy help reduce the rates of tuberculosis among HIV positive patients?
Think of synonyms or similar Think of synonyms or similar
terms or ideas to use in your terms or ideas to use in your
searchsearchPICO PICO concepts Possible search terms
Patient Population HIV positive patients in African countries
HIV positive, HIV infection, human immunodeficiency virus, Africa, Ethiopia, Eastern Africa
Intervention INH prophylaxis therapy INH prophylaxis therapy, INH preventive therapy, Isoniazid, IPT
Comparison (if any) n/a n/a
Outcome Reduction of cases of tuberculosis
Tuberculosis
Determine the best Determine the best resources resources
There are hundreds of article databases available. Which one will you use?
Most popular databases are:1. MEDLINE (accessible either through PubMed or Ovid)2. Cochrane Library3. EMBASE4. Web of Science5. Scopus 6. Google Scholar????
Plan the searchPlan the search• Now you have your searchable questions and
keywords. Where do you start?
• Each database has its own indexing system. Many have their own thesaurus or list of subject headings. If the database you are using has a thesaurus, match your keywords to the thesaurus for a more efficient search.
Using a databaseUsing a databaseOnce you’ve chosen a database, such as Medline or PubMed, search for each concept separately
Use OR to combine synonyms or similar terms or concepts (HIV+ OR HIV positive)
Use AND to combine separate concepts (HIV positive AND tuberculosis AND INH prophylaxis therapy)
• Save your searches by creating an account in each database that you use
• Use a citation management tool such as Zotero, Medeley or Endnote Web to export your citations from multiple databases
Document the search Document the search and citeand cite
• Please always evaluate the information you find, either by using given criteria or developing your own
Evaluate what you findEvaluate what you find