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Related Experiment Videos

Predictive validity of the Strain Index in turkey processing.

K Knox1, J S Moore

  • 1NSF I/UCRC in Ergonomics, Texas A&M University, 130B Zachry Engineering Center, Mail Stop 3133, College Station, TX, USA.

Journal of Occupational and Environmental Medicine
|May 31, 2001
PubMed
Summary

The Strain Index effectively predicts upper extremity disorders in turkey processing jobs. This study confirms its validity, showing a strong association between hazard classification and worker health outcomes.

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Risk Assessment

Background:

  • The Strain Index is a validated method for assessing risks of upper extremity disorders.
  • Previous studies demonstrated its predictive and external validity in pork processing.

Purpose of the Study:

  • To evaluate the predictive validity of the Strain Index in a turkey processing plant.
  • To assess the association between Strain Index hazard classifications and actual worker morbidity.

Main Methods:

  • Investigators analyzed 28 jobs using the Strain Index, classifying them as hazardous or safe.
  • Worker health outcomes were retrospectively determined from OSHA 200 logs over 3 years.
  • 2x2 contingency tables were used to evaluate the association between hazard and morbidity classifications.

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Main Results:

  • For individual sides, the odds ratio was 22.0, with sensitivity of 0.86 and specificity of 0.79.
  • For jobs, the odds ratio was 50.0, with sensitivity of 0.91 and specificity of 0.83.
  • High positive predictive values (0.92 for sides, 0.95 for jobs) were observed.

Conclusions:

  • The Strain Index demonstrates strong predictive validity in the turkey processing industry.
  • These findings support the external validity of the Strain Index across different processing environments.
  • The Strain Index is a reliable tool for identifying hazardous jobs and preventing upper extremity disorders.