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Similarities and differences between MMPI and MMPI-2 applications to the assessment of posttraumatic stress disorder.

The purpose of this study was to address the question: Is the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) comparable to the original MMPI in its applicability to the assessment of posttraumatic stress disorder (PTSD) among Vietnam combat veterans? The question was addressed by administering both the original MMPI and MMPI-2 to 29 subjects classified as meeting Diagnostic and Statistical Manual of Mental Disorders (3rd ed., rev.; DSM-III-R) criteria for PTSD and comparing MMPI and MMPI-2 scores in terms of: degree of association, code-type congruence, diagnostic hit rates (when compared to two other clinical samples, and one normal sample), and congruence of the Keane PTSD Scale (PK). Results reveal highly significant correlations between MMPI and MMPI-2 basic scales for the PTSD sample as well as congruence in 2-point codes comparable to previous studies. The MMPI-2 was found to identify effectively PTSD subjects from the other groups. Results also showed a high degree of association between the MMPI and MMPI-2 in regard to PK scores, although minor differences were found in PK raw scores between the two tests. Overall, the findings suggest a high degree of comparability between the MMPI and MMPI-2 in the assessment of PTSD.

Adult

A comparison of MMPI profile types with corresponding estimated MMPI-2 profiles.

Changes in mean elevation, dispersion, overall configuration, and code type of well-defined MMPI profiles were examined after transformation to estimated MMPI-2 profiles. A total of 34 MMPI profiles from both Gilberstadt and Duker (1965) and Marks, Seeman, and Haller (1974) were analyzed using contemporary MMPI-2 T-scores. Results yielded a reduction in mean elevation and both increases and decreases in scatter about the mean upon transformation to MMPI-2 norms. The total configuration of linear MMPI and estimated MMPI-2 T-score profiles correlated highly with each other and manifested a similar pattern of correlation with the total configuration of Skinner and Jackson's (1978) three modal MMPI types.

Adult

A comparison of MMPI-2 and MMPI T-scores for men and women.

The original MMPI linear T-score norms are compared with the new linear and uniform T-score norms for the MMPI-2 across basic validity and clinical scales for both men and women. The comparison indicated more pronounced normative changes for certain scales and somewhat more pronounced changes for men than for women. Relationships between MMPI-2 and MMPI T-scores across scales are complex; a few MMPI-2 scales show enhancement, others show attenuation across the full range of the scale, and other scales show attenuation in the middle and lower ranges of the scale with enhancement in the upper ranges. Possible implications and effects of the new MMPI-2 T-score norms on original MMPI scale high-point elevation and high-point codes are discussed.

Adult

Correspondence of the MMPI and MMPI-168 among incarcerated female felons.

This study was designed to assess the correspondence between the MMPI and MMPI-168 for a sample of adult incarcerated female felons. The results indicated a high degree of agreement, median correlation of .79, between corresponding validity and clinical scales of the MMPI-168 and the full MMPI. The MMPI-168 significantly overestimated scales L, F, and D, while it underestimated scales K, Hy, Pd, and Mf. Configural correspondence between the two instruments in terms of profile high points was somewhat less than has been reported for psychiatric populations. However, the MMPI-168 appeared to be a useful short screening instrument for incarcerated female felons with respect to accurate assessment of profile validity, configural correspondence to the full MMPI, and correlations between corresponding scales. Its utility in these respects far exceeds prior attempts to employ the Mini-Mult with a similar sample of incarcerated females.

Adult

Validity and clinical scale comparisons between the MMPI and MMPI-2 with psychiatric inpatients.

This study was designed to investigate the comparability of the original MMPI (1950) and the MMPI-2 (1989) with a psychiatric patient population. 34 male and 3 female patients, shortly after admission to one of two acute psychiatry units, completed the old and revised versions of the MMPI. Paired t tests indicated but scant differences for raw scores, while many more differences were found among T scores for validity, clinical, and supplemental scales. Analyses, however, showed all scales on the two forms to be highly correlated. Analysis of the high-point and two-point codes across the two administrations also showed relative stability, although the proportion of Scales 2 (Depression) and 8 (Schizophrenia) decreased, while those for Scales 6 (Paranoia) and 7 (Psychasthenia) increased markedly in the MMPI-2 protocols. Examination of each version's discriminability among mood- and thought-disordered subsamples suggested that the MMPI provides slightly better delineation between diagnostic classes. Discriminant function analyses showed that there were essentially no differences between the two forms in the accurate classification of clinical and nonclinical groups. The findings reported here provide support for the MMPI-2; despite modification, the newer form retains the advantages of the original MMPI. Differences found here may be unique to psychiatric patients and their patterns of MMPI/MMPI-2 equivalence and may not generalize to other special populations.

Adult

Ego-strength revised: a comparison of the MMPI-2 and MMPI-1 versions of the Barron Ego-strength scale.

This study evaluated the equivalence of the original MMPI and the shortened MMPI-2 versions of the Barron (1953) Ego-strength scale, an important research scale. Three hundred fifty-five subjects took the MMPI-2 and the 16 MMPI-1 items dropped from the original scale. The omitted items appear to contribute little to the original scale. The revised version compares favorably with the old in terms of internal consistency, and the two versions are highly intercorrelated. Confirmatory Factor Analysis indicates that four of Stein and Chu's (1967) five groupings of the original items provide a reasonably good fit for the MMPI-2 as well. Compared to the original, the new version was slightly more correlated with other paper-and-pencil measures of psychological health and well-being.

Ego

The relationship of electromyographic and vasomotor activity to MMPI subgroups in chronic headache patients: the use of the original and contemporary MMPI norms.

The relationship of electromyographic (EMG) and temporal artery vasomotor activity to MMPI subgroups was examined in 60 chronic headache sufferers. Analysis of the right frontalis data revealed a significant interaction between MMPI subgroup and position (reclining, sitting, standing) with a trend toward the same interaction with the left frontalis. However, this effect was only found when the contemporary MMPI norms were utilized in the formation of the subgroups. No effects were found for the bilateral trapezius EMG or bilateral temporal artery sites. Analysis of the self report data revealed a significant main effect for the Total Pain Score of the Pain Mannequin but not for a current headache intensity rating. Again, the former effect was seen most clearly when the contemporary MMPI norms were used. In general, these data support a Psychological Distress Hypothesis in that patients with significant elevations (greater than 70) demonstrated greater frontalis EMG activity and higher Pain Mannequin scores. Additionally, the data demonstrate the importance of utilizing the contemporary MMPI norms in the formation of subgroups.

Adult

The effect of MMPI-2 on scoring of special scales derived from MMPI-1.

Twenty-nine special scales derived from the Minnesota Multiphasic Personality Inventory (MMPI-1; Hathaway & McKinley, 1983) were scored from MMPI-I and MMPI++-2 (Hathaway et al., 1989) items for a normal and a psychiatric sample. Resulting pairs of mean scores were compared. Absolute differences were found to be small but statistically significant. We concluded that, despite the statistical significance, the small absolute differences suggest that most of the MMPI-I special scales probably can be scored and interpreted from MMPI-2 items. Further research along this line is necessary.

Adult

The fragile nature of MMPI code types.

The percent of code type agreement with the original MMPI is compared with the new MMPI-2, an earlier re-norming of the MMPI by Colligan, Osborne, Swenson, and Offord (1983), the MMPI-168, and test/retest comparisons of the MMPI with itself. Code type agreement ranges from lows of 31 to 41% for the test/retest comparability of the original MMPI with itself to 40 to 67% hit rates for the MMPI-2, the MMPI 1983 norms, and the MMPI-168. The effect of this on interpretation is discussed in the context of previous studies on the MMPI code types in relation to broadband diagnosis and comparisons of clinical accuracy of computerized reports that have utilized various MMPI versions.

Humans

Social desirability and Wiggin's MMPI content scales.

Using the Minnesota Multiphasic Personality Inventory (MMPI) item pool, Wiggins (1966) developed 13 scales, each with a homogeneous content. The 13 scales, along with marker scales for the 1st 3 MMPI factors, Edward's social desirability (SD), Welsh's repression (R), and Wiggins's social desirability (Sd) respectively were scored in the MMPI. The same scales were scored in an Experimental Multiphasic Personality Inventory (EMPI). A principal-components analysis of the 16 scales when scored in the MMPI resulted in 4 factors. A principal-components analysis of these same scales when scored in the MMPI and when scored in the EMPI were found to be highly congruent. The SD, R, and Sd scales proved to be excellent markers for the 1st 3 factors of the MMPI and also for the 1st 3 factors of the EMPI. Results provide further evidence that the 1st MMPI factor is a social desirability factor rather than a content factor.

Adult

MMPI cannot say scores: normative data and degree of profile distortion.

Few previous studies have investigated MMPI Cannot Say scores (the number of items people omit in completing the MMPI). Study 1 examined the frequency of occurrence of omitted items in three different populations. A significantly higher proportion of complete MMPI answer sheets (no omitted items) was found among job applicants than among two psychiatric groups, and the vast majority of test subjects in all three groups responded to all items. Study 2 investigated the degree of profile distortion introduced by randomly omitting various numbers of MMPI items from complete answer sheets. As more MMPI items were omitted, there was a progressive reduction in the elevation of the MMPI profile, but several different analyses failed to reveal a definite point at which the number of omitted items clearly became excessive. Changes in the profile's high-point pair were sometimes produced by numbers of omitted items previously considered to be expected in a "normal" MMPI record. This type of profile distortion could alter significantly the interpretation of a profile. Changes were therefore suggested in the T-score values for the Cannot Say scale given on the standard profile.

Ambulatory Care

MMPI ratings of suicide risk.

Among past attempts to use MMPI data to predict suicidal behavior, there has been a lack of research on the ability of clinicians to identify MMPI profiles of suicidal persons. In this study, the MMPI profiles of 20 male psychiatric patients who committed suicide and the MMPI profiles of 20 male patients who did not attempt or commit suicide were presented to six clinical psychologists with expertise in MMPI interpretation. The clinicians were asked to classify each MMPI profile as coming from a patient who did or did not later commit suicide, and to rate eight variables thought to be relevant to the assessment of suicide risk. Data analysis revealed that the clinicians could not identify suicide and nonsuicide patients from their MMPI profiles. Furthermore, the ratings of the eight suicide variable did not differentiate suicide and nonsuicide patients.

Depression

Utility of the MMPI in a geriatric population.

Despite the popularity of the Minnesota Multiphasic Personality Inventory (MMPI), there exists a relative dearth of normative and validity research regarding its use with persons over the age of 60. Our investigation was designed to examine the MMPI performance of both a normal and a clinical sample of older men and women. Specifically, a nonpatient community sample of 204 subjects and an outpatient psychiatric sample of 30 subjects, between the ages of 60 and 90, were administered the MMPI as well as structured psychiatric interview, the Psychiatric Status Schedule (PSS). Results revealed that, on most of the MMPI scales, the mean scores were well above the norms (i.e., 5-10 t-score points). Through comparisons between the clinical and community subjects as well as between MMPI and PSS performance, the MMPI demonstrated substantial discriminative and concurrent criterion validity within this geriatric sample. The results of the study suggest that, with a few important exceptions, the MMPI, as generally utilized, is valid for use in the geriatric population.

Aged

Couples in marital distress: a study of personality factors as measured by the MMPI-2.

This study examines the relationship between Minnesota Multiphasic Personality Inventory-2 (MMPI-2) measured personality characteristics and marital distress and provides empirical validation for using the MMPI-2 with a marital therapy population. Studied were 150 couples in marital therapy and 841 normal couples who participated in the MMPI-2 restandardization study. The MMPI-2, a biographical form, a partner rating form, and the Dyadic Adjustment Scale (DAS) were administered to all couples. The marital counseling group resembled previous marital counseling samples studied with the MMPI and scored significantly higher than the normative sample on several MMPI-2 scales. Relationships between the DAS and MMPI-2 clinical and content scale scores are reported. The Psychopathic Deviate (Pd) clinical scale and Family Problems (FAM) content scale were the most powerful group discriminators and strongest correlates of the DAS; their use as indices of marital distress is tested. The meaning of Pd as an index in assessing personality factors in marital distress is explored.

Adaptation, Psychological

MMPI-2 profiles of women at risk for child abuse.

This study addresses the utility of the MMPI-2 in assessing personality characteristics of women who have a high potential for abusing their children. A sample of 154 women was identified on the basis of demographic characteristics as high risk for child abuse and other care-taking problems. They were evaluated (with the MMPI-2-AX form) during their pregnancy and are being followed up as part of the evaluation of a prevention/intervention program. This preliminary study compares the MMPI-2 personality characteristics of 146 of these women with several control samples: 1,462 women from the MMPI restandardization sample, 466 low education women from the restandardization sample, 84 pregnant women from the restandardization sample, and 167 women military recruits who are about the same age as the experimental group. The results show that, on the MMPI-2 clinical scales, women from the high-risk sample closely resemble child-abusing parents described in the previous MMPI literature. Moreover, these women differed significantly from all of the comparison groups on a number of MMPI-2 clinical and content scales. The clinical implications of these differences are discussed.

Adaptation, Psychological