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Reliable exposure assessment strategies for physical ergonomics stressors in construction and other non-routinized work.

Authors
Paquet-V; Punnett-L; Woskie-S; Buchholz-B
Source
Ergonomics 2005 Jul; 48(9):1200-1219
NIOSHTIC No.
20040160
Abstract
The objective of this research was to provide guidelines for the reliable assessment of ergonomics exposures in non-routinized work. Using a discrete-interval observational sampling approach, two or three observers collected a total of 5852 observations on tasks performed by three construction trades (iron workers, carpenters and labourers) for periods of several weeks. For each observation, nine exposure variables associated with awkward body postures, tool use and load handling were recorded. The frequency of exposure to each variable was calculated for each worker during each of the tasks on each of the days. ANOVA was used to assess the importance of task in explaining between-worker and within-worker variability in exposures across days. A statistical re-sampling method (bootstrap) was used to evaluate the reliability of exposure estimates for groups of workers performing the same task for different sampling periods. Most exposures were found to vary significantly across construction tasks within trade, and between-worker exposure variability was generally smaller than within-worker exposure variability within task. Bootstrapping showed that the reliability of the group estimates exposure for the most variable exposures within task tended to improve as the assessment periods approached 5-6 d, with marginal improvements for longer assessment periods. Reliable group estimates of exposure for the least variable exposures within task were obtained with 1 or 2 d of observation. The results of this study demonstrate that an initial estimate of the important environmental or task sources of exposure variability can be used to develop an efficient sampling strategy that provides reliable estimates of ergonomics exposures during non-routinized work.
Keywords
Construction; Construction-industry; Construction-workers; Ergonomics; Exposure-assessment; Sampling; Task-performance; Posture; Tools; Manual-materials-handling; Sampling-methods; Employee-exposure; Environmental-hazards; Construction-materials; Work-environment; Iron-workers; Work-practices; Author Keywords: Exposure assessment; Work sampling; Physical ergonomics stressors; Posture; Construction work; Bootstrap
Contact
Victor Paquet, Department of Industrial Engineering, University at Buffalo, State University, of New York, 342 Bell Hall, Buffalo, NY 14260-2060
CODEN
ERGOAX
Publication Date
20050715
Document Type
Journal Article
Email Address
vpaquet@eng.buffalo.edu
Funding Amount
751370
Funding Type
Cooperative Agreement; Construction
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U02-CCU-308771; Cooperative-Agreement-Number-U02-CCU-312014
Issue of Publication
9
ISSN
0014-0139
Priority Area
Musculoskeletal-system-disorders
Source Name
Ergonomics
State
NY; MA; DC
Performing Organization
Center to Protect Workers' Rights
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