Article Text

other Versions

Download PDFPDF
Developing common metrics of mechanical exposures across etiologic studies of low back pain in working populations for use in meta-analysis
  1. Lauren E. Griffith (griffith{at}
  1. McMaster University, Canada
    1. Richard P. Wells (wells{at}
    1. University of Waterloo, Canada
      1. Harry S. Shannon (shannonh{at}
      1. McMaster University, Canada
        1. Stephen D. Walter (walter{at}
        1. McMaster University, Canada
          1. Donald C. Cole (dcole{at}
          1. University of Toronto, Canada
            1. Sheilah Hogg-Johnson (shoggjohnson{at}
            1. Institute for Work and Health, Canada


              Objectives: One of the challenges of conducting meta-analyses on the relationship between workplace mechanical exposures and low back pain is that mechanical exposures are reported in a wide variety of ways. We aimed to develop common metrics to apply in the translation of literature-based workplace mechanical exposures for use in meta-analyses, and to test the metrics’ measurement properties. Methods: We developed a set of 7-point scales to capture the intensity of important aspects of mechanical exposures that may be related to the development of low back pain in workers. The scales represented three dimensions of mechanical exposures at work: 1) trunk posture, 2) weight lifted or force exerted and 3) spinal loading, and estimated both peak and cumulative loads. Measurement properties of the scales were tested through a survey of experts in biomechanics and ergonomics who were asked to rate literature-based workplace exposure definitions using the scales and provide estimates of their confidence in their ratings. Results: For each dimension the ratings for peak loads tended to be higher than the cumulative load ratings. The inter-rater reliability for the scales ranged from 0.3 to 0.5; we would need to average the ratings of at least four expert raters to have an acceptable level of reliability (>0.7). Inter-expert reliability was positively related to the experts’ level of confidence in their ratings. In most cases the ranking of intensity ratings from the experts matched the ranking of exposure intensity from the original articles. Conclusions: This study provides insight into estimating the intensity of literature-based mechanical exposure metrics using a common set of scales which can be applied across epidemiologic studies. These metrics may be useful to quantify the relationship between workplace mechanical exposure and low back pain in a systematic review and meta-analysis. Abstract Word Count: 292

              • biomechanics
              • low back pain
              • meta-analysis
              • observer variation

              Statistics from

              Request Permissions

              If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.