What is critical appraisal?
Critical appraisal is an essential part of evidence based practice and involves systematically evaluating evidence to establish whether it is valid, accurate and relevant. It is important to critically evaluate evidence to ensure its quality and clinical relevance for your proposed use. Critical appraisal can also save you time by allowing you to focus on the research that is important to you.
How do you critically appraise an article?
There are some useful tools, checklists and further reading suggestions listed below, which will guide you through the critical appraisal process.
Where can I get more help?
Critical appraisal support and training is provided by our Subject Specialist Librarian Team. Contact them at: LibrarySubjectTeam@ggc.scot.nhs.uk.
The title most often recommended by library staff as an introduction to critical appraisal is:
- Greenhalgh, T. How to read a paper: the basics of evidence based medicine. 5th ed. Chichester: Wiley-Blackwell; 2014
As well as being available in print in several editions across the Library Network, it is also available to browse online or download to a mobile device as an ebook. The original BMJ articles from 1997 on which the book chapters are based are also available, see for example:
- Greenhalgh, T. How to read a paper : getting your bearings (deciding what the paper is about), BMJ 1997;315:243
- if you don't know how to identify the study type you have in front of you OR
- you already know the study type and want to know what checklists are available
then use the Critical Appraisal Tools pathway to help you select the right tool:
If you do know the checklist you want, here are some of the commonly-used sites:
- AGREE (Appraisal of Guidelines for Research and Evaluation)
- CASP (Critical Appraisal Skills Programme) Checklists
- CASP app for iPhones
- CEBMa (Center for Evidence-Based Management) Critical Appraisal Tools
- Centre for Evidence-Based Medicine Critical Appraisal Worksheets
- DISCERN (Genetics and Consumer Health Information)
- GATE: Graphic Appraisal Tool for Epidemiological studies
- Effective Public Health Project Quality Assessment Tool for Quantitative Studies
- Health Evidence Bulletins Wales Appraisal Checklists
- Joanna Briggs Institute SUMARI (NB subscription is required to use SUMARI and its modules)
- National Collaborating Centre for Methods and Tools (Select 'Search the Registry' link and then limit results to EIPH stage 'Appraise')
- SIGN Critical Appraisal: Notes and Checklists
- University of Glasgow General Practice and Primary Care EBP Checklists
Getting to grips with statistical information is often an area of critical appraisal that people feel daunted by. General introductory books on critical appraisal will cover the basics - see the reading list below for suggestions - but here are some further resources which focus on this specific topic:
- BMJ Publishing Group : Statistics at Square One
- Health Knowledge : Making Sense of Results
- NHS Choices : Health News Glossary
- Understanding Research Evidence by NCCMT
- Bandolier, What is… Critical Appraisal
- Centre for Evidence-Based Medicine (Oxford)
- Critical Appraisal Tools video (Health Library for North Staffordshire)
- Evidence-Based Medicine (Patient UK)
- Finding and Appraising the Evidence (HealthKnowledge)
- SIGN: Guidelines developers handbook(includes checklists on methodologies)
The following titles on critical appraisal skills are held in the Library Network.
- Barton, B. & Peat, J. Medical statistics: a guide to SPSS, data analysis and critical appraisal. Oxford, Wiley Blackwell; 2014
- Bootland, D. Critical appraisal for FCEM. Boca Raton, FL: CRC Press; 2015
- Bowers, D. Understanding clinical papers. Chichester : Wiley Blackwell; 2014
- CASP (Critical Appraisal Skills Programme). Evidence-based health care : a CASP CD-ROM and workbook. Oxford : Update Software, 2005
- Crombie, K. The pocket guide to critical appraisal. London: BMJ Publishing Group; 1996
- Dicenso, A., Guyatt, G. & Ciliska, G. Evidence-based nursing: a guide to clinical practice. St Louis, MI: Elsevier Mosby; 2005
- Gosall, N. & Gosall, G. The doctor's guide to critical appraisal. 4th ed. Cheshire: PasTest; 2014
- Guyatt, G., Rennie, D., Meade, M.O. et al. Users’ guides to the medical literature: a manual for evidence-based clinical practice. 2nd ed. New York: McGraw Hill; 2008
- Herbert, R. et al. Practical evidence based physiotherapy. 2nd ed. London: Churchill Livingstone; 2011
- Kaura, A. Evidence-based medicine: reading and writing medical papers. Edinburgh: Mosby Elsevier; 2013
- Lobiondo-Wood, Geri. Nursing research: methods and critical appraisal for evidence-based practice. 8th ed. St Louis MI: Elsevier Mosby; 2014
- Mayer, D. Essential evidence based medicine. 2nd ed. Cambridge: Cambridge University Press. 2009
- Peacock, J.L. & Peacock, P.J. Oxford handbook of medical statistics. Oxford: Oxford University Press; 2011
- Riegelman, R. Studying a study and testing a test: how to read the medical evidence. Philadephia, PA: Lippincott Williams & Wilkins; 2005
- Rumsey, D. Statistics for Dummies. 2nd ed. Hoboken, NJ: Wiley; 2011
- Schneider, Z., Whitehead, D. & Elliot, D. Nursing & midwifery research: methods and appraisal for evidence based practice. 3rd ed. Marrickville: Mosby Elsevier; 2007