Evidence-based practice (EBP) has been defined as “a problem-solving approach to the delivery of health care that integrates best evidence from studies and patient care data with clinician expertise and patient preferences and values”
Level I: Evidence from a systematic review or meta-analysis of all relevant randomized controlled trials (RCTs)
Level II: Evidence from well-designed RCTs
Level III: Evidence from well-designed controlled trials without randomization
Level IV: Evidence from well-designed case-control and cohort studies
Level V: Evidence from systematic reviews of descriptive and qualitative studies
Level VI: Evidence from single descriptive or qualitative studies
Level VII: Evidence from the opinion of authorities and/or reports of expert committees
[Source: Melnyk, B.M. & Fineout-Overholt, E. (2011). Evidence-Based Practice in Nursing and Healthcare: A Guide To Best Practice (2nd ed.). Philadelphia : Wolters Kluwer/Lippincott Williams & Wilkins, p. 12]
An important step in writing a paper is showing the strength and rationale of the evidence you chosen. The following document discusses the reasoning, grading, and creation of a "Table of Evidence." While tables of evidence can differ, the examples given in this article are a great starting point.