Abstract
The paper aims primarily to study the sensitivity of Rapid upper limb assessment (RULA) and identification of insensitive and sensitive posture zones. The sensitivity analysis of RULA along with the ordinal regression analysis offer deeper insights into the methodology used for the assessment of posture. Full factorial design was divided into parts using a forward approach to access the sensitivity. One parameter was changed while keeping other parameters fixed to understand its effect on the output score. Combinations of posture where no change was observed and corresponding ranges were noted. Posture scores were also noted involving sudden jumps. Ordinal regression analysis was performed to identify the most influencing body variable and its weight in estimating the grand RULA score. The justification of the RULA methodology available in the existing literature is very limited. This paper demonstrates the need for understanding of RULA method among the researchers. With this paper, ergonomic practitioners can be made aware of insensitive and sensitive zones in posture assessment.
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