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      A Guideline of Selecting and Reporting Intraclass Correlation Coefficients for Reliability Research

      research-article

      , PhD a , * , , BPS b

      Journal of Chiropractic Medicine

      Elsevier

      Reliability and validity, Research, Statistics

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          Abstract

          Objective

          Intraclass correlation coefficient (ICC) is a widely used reliability index in test-retest, intrarater, and interrater reliability analyses. This article introduces the basic concept of ICC in the content of reliability analysis.

          Discussion for Researchers

          There are 10 forms of ICCs. Because each form involves distinct assumptions in their calculation and will lead to different interpretations, researchers should explicitly specify the ICC form they used in their calculation. A thorough review of the research design is needed in selecting the appropriate form of ICC to evaluate reliability. The best practice of reporting ICC should include software information, “model,” “type,” and “definition” selections.

          Discussion for Readers

          When coming across an article that includes ICC, readers should first check whether information about the ICC form has been reported and if an appropriate ICC form was used. Based on the 95% confident interval of the ICC estimate, values less than 0.5, between 0.5 and 0.75, between 0.75 and 0.9, and greater than 0.90 are indicative of poor, moderate, good, and excellent reliability, respectively.

          Conclusion

          This article provides a practical guideline for clinical researchers to choose the correct form of ICC and suggests the best practice of reporting ICC parameters in scientific publications. This article also gives readers an appreciation for what to look for when coming across ICC while reading an article.

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          Author and article information

          Contributors
          Journal
          J Chiropr Med
          J Chiropr Med
          Journal of Chiropractic Medicine
          Elsevier
          1556-3707
          1556-3715
          June 2016
          31 March 2016
          : 15
          : 2
          : 155-163
          Affiliations
          [a ]Director & Associate Professor, Foot Levelers Biomechanics Research Laboratory, New York Chiropractic College, Seneca Falls, NY
          [b ]DC Candidate, Foot Levelers Biomechanics Research Laboratory, New York Chiropractic College, Seneca Falls, NY
          Author notes
          [* ]Corresponding author: Terry K Koo, PhD, 2360 State Route 89, Seneca Falls, NY, 13148.2360 State Route 89Seneca FallsNY13148 tkoo@ 123456nycc.edu
          Article
          PMC4913118 PMC4913118 4913118 S1556-3707(16)00015-8
          10.1016/j.jcm.2016.02.012
          4913118
          27330520
          208767a5-5c8b-48eb-b752-a13213975229
          © 2016 National University of Health Sciences.
          Categories
          Cracking the Code: Providing Insight Into the Fundamentals of Research and Evidence-Based Practice

          Reliability and validity, Statistics, Research

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