Vibrations affecting the whole body, physically hard work, frequently twisting or bending, standing up, and concentration demands proved to be risk factors for the occurrence of low back pain, even after controlling for age, sex, educational level, and duration of employment in a specific occupation.
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Risk factors in low-back pain. An epidemiological survey.
John W. Frymoyer, Malcolm H. Pope, Janice H. Clements et al. · Journal of Bone and Joint Surgery · 1983 · 748 citations
Epidemiologic Studies of Low-Back Pain
John W. Frymoyer, Malcolm H. Pope, Michael C. Costanza et al. · Spine · 1980 · 522 citations
Family Medicine, Lumbosacral Radiculopathy, Pain Syndrome +15