Reporting levels of evidence is an important part of critical appraisal.
In Australia NHMRC Levels of Evidence are used. However institutions around the world may use other levels of evidence. Always cite the source of the level of evidence you are using.
The critical appraisal process hinges on three questions that apply to any study:
1. Are the results of the study valid? (Validity)
2. What are the results? (Reliability)
3. Will the results help me in caring for my patients? (Applicability)
The critical appraisal process provides clinicians with the tools to interpret the quality of studies and determine the applicability of the synthesis of multiple studies' results to their patients.
Source: Duke University: https://guides.mclibrary.duke.edu/ebm/appraise
Textbook of Medical Statistics : For Medical Students
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