Project Methodology 5

Health Evidence Bulletins - Wales (logo)

EXAMPLES OF  SEARCH STRATEGIES USED IN THE PROJECT 

SEARCH FILTERS FOR MEDLINE (OVID)  

GUIDELINES
Developed by the Evidence Based Informatics Project at McMaster University, Canada

01        guideline.pt.
02        practice guideline.pt.
03        exp guidelines/
04        health planning guidelines/

05        or/1-4

 RANDOMISED CONTROLLED TRIALS 

from the Evidence Based Informatics Project at McMaster University and a discussion with Sam Vincent (Clinical Evidence, London:BMA).
NB The Cochrane Library Controlled Trials Register now includes all the controlled trials in Medline plus many other trials, and they are currently adding trials from Embase. 

Set   Search                                       
---------------------------------------------------------------------------

01   random:.tw,sh,pt. or placebo:.tw,sh.  
02   (clinical trial or controlled clinical trial).pt.
03   ((single or doubl: or tripl: or treb:) and (blind: or mask:)).tw,ab
04   or/1-3
                                                        

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SYSTEMATIC REVIEWS AND/OR META-ANALYSES - FILTER 1

From Boynton J et al.  Identifying systematic reviews in Medline.  Developing an objective approach to search strategy design.  Journal of Information Science  1998; 24(3): 137-157
Strategy sensitivity = 98%, precision=20%

01        (meta or synthesis or literature).ab
02        (randomized or trials or controlled).hw
03        (published or extraction or search or medline or selection).ab
04        meta-analysis.pt

05        (sources or trials or review).ab
06        (articles or reviewed or english or language).ab
07       
or/1-6

/ = subject heading
ab = word contained in abstract
hw = word contained in title, abstract or subject heading
pt=publication type
sh = word contained in subject heading
tw = word contained in title or abstract

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SYSTEMATIC REVIEWS  AND/OR META-ANALYSES AND OTHER STUDIES – FILTER 2
A more specific, but less sensitive, filter from the Evidence Based Informatics Project at McMaster University.

Set   Search                                                                          
---------------------------------------------------------------------------

01   meta-analysis.pt,sh.
02   (meta-anal: or metaanal:).tw.
03   (quantitativ: review: or quantitativ: overview:).tw.
04   (systematic: review: or systematic: overview:).tw.
05   (methodologic: review: or methodologic: overview:).tw.
06   (integrative research review: or research integration:).tw.
07   quantitativ: synthes:.tw.
08   or/1-7                              ‘Quick’ search for systematic reviews/meta-analyses
09   (medline or medlars).tw,sh. or embase.tw.
10   (scisearch or psychinfo or psycinfo).tw.

11   (psychlit or psyclit).tw.
12   (hand search: or manual search:).tw.
13   (electronic database: or bibliographic database:).tw.        
14   (pooling or pooled analys: or mantel haenszel).tw.         
15   (peto or der simonian or dersimonian or fixed effect:).tw.
16   or/9-15
17   review.pt,sh. or review:.tw. or overview:.tw.    
18   16 and 17                                  
19   9 or 18                                                                             Most systematic reviews

20   random:.tw,sh,pt. or placebo:.tw,sh.                  
21   (clinical trial or controlled clinical trial).pt.          
22  (single or doubl: or tripl: or treb:) and (blind: or mask:)

23
      or/20-22                                    
24
      19 and 23                                              Systematic reviews/meta-analyses of therapies

Search Filter to be added to the Systematic Reviews of Therapies Filter above to look for Observational Studies (Type IV evidence)
(under development for the Health Evidence Bulletins - Wales project )

024     = systematic reviews of therapies filter (as above)
025     comparative study.sh
026     exp evaluation studies/
027     follow up studies.sh
028     prospective studies.sh
029     (single group pre-post or cohort or time series or case-control:).tw
030     or/25-29

031     30 not (19 or 23)                              Observational studies

SEARCH FILTERS FOR EMBASE (OVID Internet) 

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RANDOMISED CONTROLLED TRIALS  

Developed for use in the Health Evidence Bulletins – Wales  from the McMaster Medline strategy and as a result of discussion with Sam Vincent (Clinical Evidence, London: BMA,  NB The NHS Centre for Reviews and Dissemination is currently developing strategies for use with Embase)

1.      exp Randomized Controlled Trial/
2.
      randomi?ed controlled trial.mp
3.
      (random: or placebo: or double-blind:).mp
4.
      or/1-3
5.
      controlled clinical trial.mp
6.
      4 and 5 

SYSTEMATIC REVIEWS AND/OR META-ANALYSES 

Developed for use in the Health Evidence Bulletins – Wales from the McMaster Medline strategy

1.      exp meta analysis/
2.
      meta-anal:.mp
3.
      metaanal:.mp
4.
      quantitativ: review :.mp
5.
      quantitativ: overview:.mp
6.
      systematic: review:.mp
7.
      systematic: overview:.mp
8.
      methodologic: review:.mp
9.
      methodologic: overview:.mp
10.
integrative research review:.mp
11.
research integration:.mp
12.
quantitativ: synthes:.mp
13.
(medline or medlars or embase).mp
14.
hand search:.mp
15.
manual search:.mp
16.
(pooling or pooled analy:).mp
17.
mantel haenszel.mp
18.
(peto or der simonian or dersimonian or fixed effect:).mp
19.
 (scisearch or psychinfo or psycinfo or psychlit or psyclit).mp
20.
(electronic database: or bibliographic database:).mp
21.
or/1-20                             SYSTEMATIC REVIEWS AND/OR META ANALYSES 

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SYSTEMATIC REVIEWS/META-ANALYSES OF THERAPIES

If the randomised controlled trials filter is added to the end of the systematic reviews filter as lines 22-26 and lines 21 and 26 are combined then:  027     21 and 26  = systematic reviews of therapies

SEARCH FILTER FOR CINAHL (OVID) 

SYSTEMATIC REVIEWS AND/OR META-ANALYSES

Developed by the NHS Centre for Reviews and Dissemination.  This search has a high recall but a low precision.  The NHS CRD plan to develop the strategy into a tiered approach with the most precise search terms listed first.

01        meta analysis/
02        meta-analysis research/
03        metaanaly:.tw.
04        meta-analy:.tw.
05        cochrane:.tw.
06        nursing interventions.pt.
07        (review: or overview:).ti.
08        literature review/
09        literature searching/
10        computerized literature searching/
11        synthes:.tw. adj3 (literature: or research: or studies or data).tw.
12        (medline or medlars or embase or scisearch or psycinfo or psychinfo or
psyclit or psychlit).tw,sh.
13        pooled analy:.tw.
14        ((data adj2 pool:) and studies).tw.
15        ((hand or manual: or database: or data base: or computer:) adj2 search:).tw.
16        reference databases/
17        ((electronic: or bibliographic:) adj2 (database: or data base:)).tw.
18        review.pt.
19        (review: or overview:).ab.
20        (systematic: or methodologic: or quantitativ: or research: or literature: or studies or trial: or effective:).ab.
21        18 and 20
22        19 adj10 20
23        or/1-17,21,22
24        editorial.pt.
25        letter.pt.
26        case study.pt.
27        record review/
28        peer review/
29        (retrospective: adj2 review:).tw.
30        (case: adj2 review:).tw.
31        (record: adj2 review:).tw.
32        (patient: adj2 review:).tw.
33        (patient: adj2 chart:).tw.
34        (peer adj2 review:).tw.
35        (chart: adj2 review:).tw.
36        (case: adj2 report:).tw.
37        exp case control studies/
38        exp prospective studies/
39        case studies/
40        animal studies/
41        (rat:or mouse or mice or hamster: or animal: or dog: or cat: or rabbit: or bovine or sheep).tw.
42        or/24-41
43        42 not (42 and 23)

44        23 not 43                    = SYSTEMATIC REVIEWS AND/OR META ANALYSES

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SEARCH FILTER FOR PSYCLIT/CLINPSYC/PSYCINFO 

Used in the Health Evidence Bulletins Wales project.

1             meta analysis.sh
2             meta-anal:.tw
3             metaanal:.tw
4             meta analysis.id
5             (systematic: and (review: or overview)).tw
6             (critical: and apprais:).tw
7             (critical: and review:).tw
8             or/1-7
9             literature review.sh
10         literature review.id
11         9 or 10
12         8 or 11
13         case report.sh
14         8 not 13
15         12 not 13

16         limit 14 to human                    SYSTEMATIC REVIEWS AND/OR META ANALYSES

17         limit 15 to human                 Systematic reviews/meta-analyses and some other reviews

18         treatment effectiveness evaluation.sh
19         (random: and trial:).tw
20         (random: and allocat:).tw
21         double blind.tw
22         single blind.tw
23         or/18-22
24         limit 23 to human
25         clinical trial.id
26         clinical trial:.tw
27         (singl: or doubl: or trebl: or tripl:) adj5 blind.tw
28         (clin: adj25 trial:).ti,ab
29         placebo:.tw
30         placebo:.id
31         placebo:.ti,ab
32         random:.ti,ab
33         methodology.sh
34         experimental design.sh
35         experimentation.sh
36         experimental methods.sh
37         or/25-36

38         limit 38 to human                    RANDOMISED CONTROLLED TRIALS

39         effectiveness.id
40         followup studies.sh
41         posttreatment followup.sh
42         treatment outcomes.sh
43         longitudinal studies.sh
44         (control: or prospectiv: or volunteer:).ti
45         comparative study.tw
46         or/39-45

47
       limit 46 to human                    CONTROLLED PROSPECTIVE AND OTHER STUDIES

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