Validation of the Strain Index in Manufacturing Facilities

Abstract

The Strain Index is a semi-quantitative job analysis methodology developed on the basis of biomechanics, physiology, and epidemiology to predict jobs that place workers at an increased risk of developing a musculoskeletal disorder. Thirty jobs were classified based on the Strain Index score and morbidity. A comparison of the Strain Index score and the morbidity resulted in a sensitivity of 100%, specificity of 88%, positive predictive value of 67%, and negative predictive value of 100%. This suggests that the Strain Index is a valid tool to identify at risk jobs in industrial settings.