Intra-class and inter-class reliability of REBA method: A practice in an automotive subsidiary company


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Cakmak G., ESEN H.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.39, no.1, pp.261-269, 2023 (SCI-Expanded) identifier identifier

Abstract

Purpose: REBA is a widely used tool in research and practice in working posture analysis. The aim of this study is to evaluate the reliability of analysis which are made with REBA method. Also, to examine the reliability of the working postures obtained from different departments in the analysis, intra-class and inter-class reliability analyses of each group were also performed.Theory and Methods: 200 working postures belonging to different work groups selected from a company operating in the automotive subsidiary industry were analyzed by 4 different raters by using REBA method. These scores were assessed with intra-rater (same observer in different time zones reviews) reliability analysis and inter -rater (evaluations belonging to different observers) reliability analysis.Results: Inter-class reliability analysis results which made in %95 confidence interval shows that A score((Intraclass Correlation Coefficient -ICC=0.871), C score (ICC=0.844) and final REBA score (ICC=0.852) are high level of reliability. However, B score (ICC=0.704) is medium level of reliability. According to intra-class reliability analysis results which made in %95 confidence interval REBA method analyses working postures with high level of reliability. Conclusion: REBA method shows high level of reliability. However, to increase the reliability of the B score analysis, the evaluation criteria of arm and wrist postures in REBA trainings should be explained in more detail and the grip score criteria should be rearranged in a way that avoids personal interpretations.