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The stability of the MCMI-II for psychiatric inpatients.

The MCMI-II (Millon, 1987) has been introduced recently as a successor to the MCMI-I (Millon, 1983). Because numerous revisions have been made in the MCMI-II, it will need to be cross-validated as an instrument distinct from the MCMI-I. The purposes of this study were to: (1) cross-validate the test-retest stabilities for MCMI-II personality and symptom scales; and (2) compare and contrast the MCMI-II and MCMI-I in regard to scale stability. The MCMI-II was administered to 98 psychiatric inpatients at admission and discharge. Results were generally consistent with the data reported by Millon (1987), in that the basic personality scales evidenced the greatest stability, the pathological personality scales somewhat lower stability, and the symptom scales the least stability. Compared to the MCMI-I, test-retest coefficients were generally higher for the MCMI-II.