4.5 Article

OWAS inter-rater reliability

期刊

APPLIED ERGONOMICS
卷 93, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.apergo.2021.103357

关键词

OWAS; Working postures; Risk assessment; Reliability analysis

资金

  1. funding initiative Niedersachsisches Vorab of the Volkswagen Foundation
  2. Ministry of Science and Culture of the Lower Saxony State (MWK) as a part of the Interdisciplinary Research Centre on Critical Systems Engineering for SocioTechnical Systems II

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The OWAS method shows high agreement in assessing arm postures at over 98%, but lower agreement for leg postures (66-97%) and upper body postures (80-96%). There was no significant difference between raters with and without intense prior training in physical therapy, indicating general reliability especially for raters with non-specialized backgrounds but weaknesses in detecting specific postures.
The Ovako Working posture Assessment System (OWAS) is a commonly used observational assessment method for determining the risk of work-related musculoskeletal disorders. OWAS claims to be suitable in the application for untrained persons but there is not enough evidence for this assumption. In this paper, inter-rater (interobserver) reliability (agreement) is examined down to the level of individual postures and categories. For this purpose, the postures of 20 volunteers have been observed by 3 varying human raters in a laboratory setting and the inter-rater agreement against reference values was determined. A high agreement of over 98% (kappa = 0.98) was found for the postures of the arms but lower agreements were found for posture classification of the legs (66-97%, kappa= 0.85) and the upper body (80 - 96%, kappa = 0.85). No significant difference was found between raters with and without intense prior training in physical therapy. Consequently, the results confirm the general reliability of the OWAS method especially for raters with non-specialized background but suggests weaknesses in the reliable detection of a few particular postures.

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