A multivariate clustering procedure was used to identify replicable, homogeneous MMPI profile subgroups among three independent cohorts of male (N=233) and female (N=315) low back pain (LBP) patients. Three subgroups were replicated across all male cohorts and four subgroups were replicated across all female cohorts. Multiple discriminant analysis showed that for both male and female patients between-subgroup variability was significantly greater than within-subgroup variability. The results suggest that LBP patients may not be solely characterized by MMPI profiles featuring the “conversion V” configuration. Examination of the profile subgroups also suggests there may be distinct, pain-related, behavioral attributes associated with each subgroup which might have important implications for practitioners' choice of treatment modalities. Suggestions are made for research regarding the development of specific, optimal treatments for various LBP patient subgroups.
13 Figures and Tables
Fig. 1. Subgroup Af profde pa t te rn for I973, 1974, and 1975 cohor ts o f female LBP patients.
Fig. 2. Subgroup Bf prof'fle pattern for 1973, 1974, and 1975 cohorts of female LBP patients.
Fig. 3. Subgroup Cf profile pattern for 1973, 1974, and 1975 cohorts of female LBP patients.
Fig. 4. Subgroup Df proEfle pattern for 1973, 1974, and 1975 cohorts of female LBP patient~
Fig. 5. Discriminant space r~presentation of the centroids of the 1our temale LBP patient suogroups.
Fig. 6. Subgroup A m prot'fle pattern for 1973, 1974, and 1975 cohorts of male LBP patients.
Fig. 7. Subgroup B m prof'de pattern for 1973, 1974, and 1975 cohorts of male LBP patients.
Fig. 9. Discriminant space representation of the centroids of the three mate LBP patient subgroups.
Table I. MMPI T-Score Means (K Corrected) and Univariate F Ratios for Female LBP Patient Subgroups Averaged Across Cohorts
Table IH. Analysis of Variance for Female LBP Patient Cohort X Subgroup X Repeated Measures (MMPI Scales) 9 i , , l l
Fig. I0. Discfiminant space repre.~entafion of the centfolds of eight male LBP patient cohorts.
Table IV. Results of Female LBP Patient Cohort X Subgroup Analysis of Variance for Each MMPI Scale
Table VI. Correlations of the MMPI Scales with Two Discriminant Functions and Tests of Significance for Male LBP Patient Subgroups a
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