The MMPI was administered to the primary personality of each of the 18 multiple personality patients who had been hospitalized on an adult inpatient psychiatric ward at the UCLA Neuropsychiatric Institute over the 10-yr. period from January 1972 to January 1982. Three MMPI profiles were 4-8 codetypes, three profiles were 2-8/8-2 codetypes, three profiles were various other codetypes, and six of the profiles were invalid due to extremely high F scales. The remaining three patients refused to cooperate with the administration of the MMPI. This study helped clarify issues in using the MMPI in patients with dissociative disorders.
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