Previous research involving cluster analysis of Minnesota Multiphasic Personality Inventory (MMPI) profiles among persons with chronic low back pain has suggested the existence of four distinct profile clusters. The present study had two goals: (1) to replicate the previous finding independently and (2) to investigate the relationship of the profiles to the subjects' self-reported pain history and response to treatment. Subjects were 92 patients in a multimodal inpatient low back-pain treatment program. A cluster analysis of the MMPI profiles was performed and the resultant clusters were compared in terms of histories and treatment outcome. The four clusters were successfully replicated for the total sample and for males and females separately. The profiles were significantly related to subjects' pain histories, but only one outcome difference was found. It was inferred that the MMPI is of value in understanding patients' pain coping behaviors but that further research is needed to explore the utility of the MMPI in understanding their response to treatment.

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