Cross-validation and extension of the MMPI-A IMM scale

Seventy-five female and 76 male college undergraduates participated in a cross-validation of the IMM scale, developed for the MMPI-A. These participants completed the IMM scale which was scored in two ways: one used the regular MMPI-A score, IMMA, and the other, IMM2, was based on the subset of these items that also appear in the MMPI-2. They also completed a gender-appropriate version of the Washington University Sentence Completion Test (WUSCT) and a brief biographical questionnaire. High inter-rater reliability (.80) was established for scoring the WUSCT for ego developmental level based on the most recent version of the scoring format. Statistically significant correlations were found between ego level scores and both the IMMA and the IMM2 scales. Means and standard deviations on both IMM scales for the males and females in the MMPI-A and the MMPI-2 restandardization samples, respectively, were obtained.