secondary data analysis: systematic reviews & associated databases prof. eileen savage omcya...
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Secondary Data Analysis: Systematic Reviews & Associated Databases
Prof. Eileen Savage
OMCYA Keeping Children Safe Summer School,
12th – 16th September 2011,
UCC.
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What is a Systematic Review?
a concise scientific investigation, with pre-planned methods that summarise, appraise, synthesise and communicate the results of multiple primary studies (Cooke et al, 1997; Centre for Reviews and Dissemination, 2008).
ie Research on Research with findings of existing data becoming raw data
Differs from a narrative review/
traditional literature review
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Traditional Review vs. Systematic Review (Nasseri-Moghaddeam & Malekzadeh 2006)
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Growth of Systematic Reviews
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Systematic Reviews – Origins of Growth Expanding volume of
published & unpublished literature
Conflicting findings across studies leading to ‘uncertainty’
Contributes to Evidence Based Movement
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When to Do a Systematic Review When there is ‘uncertainty’ about the effectiveness of
interventions in practice When key questions remain unanswered e.g. about
treatments, interventions, practices, experiences etc… To inform practice/policy with best available research
evidence To identify what is known/not known in an area to guide
future research (includes research methods)
(Petticrew & Roberts 2007)
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Where to find a Systematic Review Peer Reviewed Journals (search bibliography databases) Cochrane Database of Systematic Reviews (Cochrane Library;
several Groups) Database of Abstracts of Reviews of Effects (DARE) Health Technology Assessment Database NHS Economic Evaluation Database The Campbell Collaboration Library (Groups e.g. Crime & Justice;
Education; Social Welfare; Methods; Communication & internationalization; Users Groups.
The Evidence for Policy and Practice Information and Co-ordinating Centre (EPPI-Centre), University of London. (Education; Health Promotion; Employment; Social care; Crime and Justice)
Others
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Structure of Systematic Review e.g.
Introduction/Background Questions/Aim & Objectives Criteria for considering studies Search Methods Methods of the Review (e.g screening reading
papers; quality assessment; data extraction) Results Discussion Conclusions
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Criteria for Including/Excluding Studies Types of Studies (see hierarchy of evidence)
Types of Participants
Types of Outcomes
Link to Questions being asked
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Hierarchy of Evidence
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Search Method
Search Terms Databases +/- Hand searching+/- Reference lists+/-Grey Literature+/- Contacting authors (Refer to Booth et al on standards for Reporting Search Methods)
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Date of Search 30th March 2011Years Covered January 1990 to March 2011
Complete Strategy
1. cystic fibrosis. ti,ab,de.2. mucoviscidosis. ti,ab,de.3. 1 or 24. 'clinical trial'. ti,ab,de.5. 'trial'. ti,ab,de.6. random*'. ti,ab,de.7. 4 or 5 or 68. educat*. ti, ab, de.9. program*. ti,ab,de.10. 8 or 911. self care ti, ab, de.12. selfcare. ti,ab,de.13. self management. ti, ab,de14. manag*. ti, ab,de.15. 11 or 12 or 13 or 1416. 10 or 1517. 3 and 7 and 16
Date of Search 30th March 2011
Years CoveredJanuary 1990 to March 2011
Complete Strategy
1. cystic fibrosis.TX.2. mucoviscidosis.TX.3. 1 or 24. clinical trial.PT.5. trial.TX.6. random*TX.7. 4 or 5 or 68. educat*.TX.9. program*TX.10. 8 or 911. self care.TX.12. self-care.TX.13. selfcare. TX.14. self management. TX.15. self-management.TX.16. manag*.TX.17. 11 or 12 or 13 or 14 or
15 or 1618. 10 or 1719. 3 and 7 and 18
Language Restrictions None
Search Strategy: CINAHL with Full Text (EBSCO)
Search Strategy: Embase (Elsevier)
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Methods – Screening for Inclusion/ Exclusion
Titles & Abstracts – In/Unsure/Out Read in full –> in/unsure /out
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Quality Assessment of Individual Studies Quality threshold for inclusion ie exclude poor
quality studies Assessment of Quality may be part of SR
How
- No –’gold standard’ exists - Checklists available e.g. CASP - Quality Scales/Criteria
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Data Extraction
Use a data extraction form (s)
2 or more reviewers / cross-check
Extract details relevant to Questions/ Objectives
Present raw data in report – table format
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Data Analysis & Synthesis Collation & summary of results Present in tabular form/forest plots/other +
descriptive narrative account +/- Meta-analysis, if appropriate (not possible
with heterogeneity ie cannot pool apples with oranges for the purpose of statistical analysis as one data set)
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Results, Discussion, Implications
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Critical Appraisal of Systematic Reviews
The PRISMA Statement: standards for reporting SRs & Meta-analyses
Critical Appraisal Tool Kit for SRs (CASP)
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Website on Critical Appraisal Tools (covers a range of methods) At:
Division of Health SciencesInternational Centre for Allied Health Evidence
http://www.unisa.edu.au/cahe/Resources/CAT/default.asp
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References To follow