Characteristics of chronic pain patients: factor analysis of the MMPI-2.

The Minnesota Multiphasic Personality Inventory (MMPI) has been used extensively in the assessment of chronic pain patients. More recent studies using cluster-analytic techniques, investigation of sub-scales, and factor analysis have refined its usefulness. The present study factor-analyzed MMPI-2 data from a sample of 114 chronic pain patients from two different treatment programs.