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Thirty patients with fibrositis and 2 control groups, one of rheumatoid arthritis patients and the other of arthritis patients with other than rheumatoid arthritis, were compared on the basis of the Minnesota Multiphasic Personality Inventory (MMPI) to assess the role of psychologic factors in fibrositis. Patients with fibrositis differed in both elevation and variability in their MMPI profiles, indicating that they were more psychologically disturbed than patients with rheumatoid or other types of arthritis. The fact that almost all of the fibrositis patients' MMPI scales were higher suggests that we might be dealing with a number of different psychologic disturbances that have stiffness and musculoskeletal pain as principal and common symptoms.
Payne et al. (Mon,) studied this question.