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Epidemiology - Flexion and Rotation of the Trunk and Lifting at Work Are Risk Factors for Low Back Pain: Results of a Prospective Cohort Study - A 3-year prospective cohort study was carried out to investigate work-related physical risk factors for low back pain. A moderate increased risk of low back pain was observed for workers who worked with the trunk in a minimum of 60 degrees of flexion for more than 5% of the working time, for workers who worked with the trunk in a minimum of 30 degrees of rotation for more than 10% of the working time, and for workers who lifted a load of at least 25 kg more than 15 times per working day./
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