There are three key questions you need to ask of all studies found in your search for evidence.
Are the results valid?
What are the results?
Will the results help in caring for patients?
Melnyk, B. M., & Fineout-Overholt, E. (2015). Evidence-based practice in nursing & healthcare: a guide to best practice. Philadelphia, PA : Wolters Kluwer, [2015]..
Articles on Critical Appraisal of the Evidence. JSU login required for access.