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Comparison of Three Methods Assessing the Ergonomic Risks of Manual Lifting Tasks at Ship Engine Manufacturing Facilities  

Kim, Sun Ja (Department of Occupational Health and Safety Engineering, Inje University)
Shin, Yong Chul (Department of Occupational Health and Safety Engineering, Inje University)
Kim, Boo Wook (Department of Occupational Health and Safety Engineering, Inje University)
Kim, Hyun Dong (Department of Occupational Health and Safety Engineering, Inje University)
Woo, Ji Hoon (Department of Preventive and Occupational Medicine, Pusan National University)
Kang, Dongmug (Department of Occupational Health and Safety Engineering, Inje University)
Lee, Hyun Seok (Department of Occupational Health and Safety Engineering, Inje University)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.15, no.2, 2005 , pp. 104-113 More about this Journal
Abstract
A variety of ergonomic assessment methods of lifting tasks known as a major cause of work-related lower back pain have been used. But there is a limited information in choosing the most appropriate assessment method for a particular job and in finding out strengths and weakness of the methods. The purpose of this study was to assess and compare the ergonomic risks of lifting tasks in a marine diesel engine production industry by three lifting ergonomic assessment tools widely used: the National Institute for Occupational Safety and Health(NIOSH) Revised Lifting Equation(NLE), the Washington Administrative Code 296-62-0517(WAC), and the Snook Tables. Lifting index(weight of load/Recommended Weight Limit) of NLE($LI_{NLE}$) was above 1 at 34 tasks(75.6%) of a total number of 45 lifting tasks. LI of WAC($LI_{WAC}$) was above 1 at 11 tasks(24.4 %). LI of Snook Table($LI_{Snook}$) was above 1 at 29 tasks(64.4%). Thus, LI was high in orders of $LI_{NLE}$ > $LI_{Snook}$ > $LI_{WAC}$. There were significantly high correlations among three Lls(p<0.01). The correlation coefficients between $LI_{NLE}$and the other three Lls($LI_{WAC}$ and $LI_{Snook}$) were r=0.93 and r=0.88, respectively. The linear regression equations were y = 0.444x + 0.11(r=0.93) between $LI_{NLE}$ and $LI_{WAC}$, y = 0.93x + 0.008(r=0.88) between LI(NLE) and $LI_{Snook}$. The LI values by WAC was significantly lower than those by the other tools. The compared features, strength and limitation among these tools were described in this paper.
Keywords
Musculoskeletal disorders; Ergonomic risk of lifting task; Snook Table; NlOSH Lifting Equation; WAC;
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