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Responses to the Minnesota Multiphasic Personality Inventory (MMPI) were used to develop a 29-item scale designed to predict the treatment outcome of 135 patients with Myofascial Pain-Dysfunction (MPD) Syndrome. The results suggested that a single scale to predict treatment outcome would be ineffective due to the absence of consistent personality differences in MPD patients.
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Millstein-Prentky et al. (1979) studied this question.
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