What is critical appraisal?
It is about systematically evaluating the evidence for accuracy, relevance and validity; eliminating research that isn’t relevant or robust enough for the question you are asking
Why is it important?
Much of the research, although methodologically valid, will not be clinically relevant and valid for your research purposes.
How do you critically appraise an article?
In addition to asking questions about author credentials, the journal publication and the date, there are some very useful tools to help you establish the relevance, accuracy and validity of the research.
CASP-UK has eight checklists of questions designed to quickly evaluate your chosen article including:
Clinical Prediction Rule
RCTs How to critically appraise a randomised controlled trial (RCT) using the CASP checklist Barts Health Knowledge and Library Services’ have developed a series of bite-sized videos using the CASP tool
These videos where developed by Cochrane Common Mental Disorders, Northumberland, Tyne and Wear NHS Foundation Trust (NTW) and Tees, Esk and Wear Valleys NHS Foundation TrUST (TEWV). Each video has links to the relevant CASP checklist and short quiz.
- Introduction to critical appraisal
- Systematic reviews & meta-analysis
- Randomised controlled trials
- Cohort studies
- Case control studies
- Cross-sectional studies
- Diagnostic studies
CEBM has tools for evaluating RCTs, systematic reviews and diagnostics. It also contains calculators for checking statistics, the all-purpose 2×2 table, probabilities and confidence intervals
Useful books in the library include:
Bootland, D et al. Critical appraisal from papers to patients: a practical guide. CRC Press. 2017
Gosall N K & Gosall G S. The doctor’s guide to critical appraisal. 4th ed. 2015. Knutsford: PasTest
Greenhalgh T. How to read a paper: the basics of evidence-based medicine. 6th ed. 2019. John Wiley
Issa M. Critical appraisal made easy: evidence based medicine. 2018 PBG Group
ClinicalKey has several books with chapters on Critical appraisal and evaluating the statistics.
Lee W & Hotopf M. Critical appraisal: reviewing scientific evidence and reading academic papers. In Wright P, Stern J & Phelan M. (eds.) Core psychiatry. 3rd ed. 2012 Elsevier
Schumacher KR., McCrindle BW & Pasquali SK Description and analysis of data, and critical appraisal of the literature. In Anderson’s Pediatric cardiology. 4th ed. 2020 Elsevier