Part of your assignment requires you to fill out an Evidence Synthesis Chart.
If you are unfamiliar with any of the ideas on the chart, you should consult your textbook:
Melnyk, B. Mazurek & Fineout-Overholt, Ellen. (2011). Evidence-Based Practice in Nursing & Healthcare: A Guide to Best Practice. Philadelphia: Wolters Kluwer/Lippincott Williams & Wilkins
...or use some of the videos and guides on this page.
Levels of Evidence
Classifying evidence into different levels based on research design is an important part of Evidence Based Practice, but there are different systems for organizing these levels depending on the purpose of the evidence (e.g. prognosis vs. treatment). Here is one of the more commonly cited levels of evidence for treatment studies.
This short article provides a nice introduction and description.
Burns, P.B., Rohrich, R.J., & Chung, K.C. (2011). The levels of evidence and their role in evidence based medicine. Plastic and Reconstructive Surgery, 128(1), 305-310.
Independent vs Dependent Variables