One of the most important steps 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.
Fineout-Overhold, E., Melnyk, B., Mazurek, Stillwell, S.B., Williamson, K.M. (2010). Evidence-based practice step by step: Critical appraisal of the evidence: Part 1. AJN American Journal of Nursing. 110 (7): 47-52.