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What is Evidence Rating?

Evidence rating is a process by which scientific evidence is used to support recommendations about clinical decisions. Evidence rating has become an expectation of multidisciplinary health care organizations.

AORN embarked on the journey towards writing its national guidelines using a systematic review of the evidence in 2012. At that time the tools used by AORN guideline authors were adapted from tools created by the Johns Hopkins School of Nursing (JH) and the Oncology Nurses Society (ONS). These adapted tools were an excellent place to begin the process of guideline development using a systematic review and have assisted AORN in creating its own evidence rating model and evidence appraisal tools. AORN has now applied the multiple lessons learned from this experience to revise and update these tools in order to create a new evidence rating model, hierarchy of evidence, and expanded appraisal tools. 

The tools can be used by any nurse or student interested in evidence based practice and can be viewed and downloaded from the following links:

AORN Evidence Rating Model 

AORN Non-Research Evidence Appraisal Tool 

AORN Research Evidence Appraisal Tool - Study 

AORN Research Evidence Appraisal Tool - Summary 

Find news and other information as this evidence ranking and rating of AORN's guidelines is implemented.

Translating Evidence to Practice for Mechanical Venous Thromboembolism ProphylaxisAORN Journal, November 2012

Management Connections: Understanding evidence rating of AORN recommended practices (PDF) – AORN Connections, February 2012

Weighing the evidence for sterilization (PDF) – AORN Connections, November 2011

Selection of a Method to Rate the Strength of Scientific Evidence for AORN RecommendationsAORN Journal, April 2011

Guidelines for Perioperative Practice


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