Prediction of MMPI-2 Clinical Scales for Incomplete Protocols: Comprehensive Short-Form Analysis

Abstract

The MMPI-2 is a thorough tool for personality assessment that has substantial importance in the field of neuropsychology. However, there have been reported problems for many neurologically impaired individuals who do not complete the test because of the demands of its length. Incomplete protocols are of little value with no formal way of scoring and interpreting the completed items. The following study examined the clinical utility of short-form versions of the MMPI-2 validity and clinical scales. Raw score correlations between various short-form and full-form tests on all validity and clinical scales, as well as mean raw score differences between short-form and full-forms were examined. These mean raw scores were converted into T-scores to determine how accurately short-form versions can predict T-scores within 5 and 10 points. The following provides normative tables which can provide useful scoring and interpretation guidelines for incomplete protocols with varying number of items completed (e.g. 180, 200, 250, and 300 items completed).