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Low back pain patients' responses to the McGill Pain Questionnaire (MPQ) were factor analyzed using the principal factor method and direct oblique rotation procedures. Four factors were extracted that accounted for 55% of the total variance. Coefficients of congruence were computed in order to relate the current factors with those extracted in a previous factor analytic investigation. The results provided positive evidence that the sensory pressure, evaluative, and affective-sensory factors that were previously identified are stable dimensions underlying the MPQ responses of low back pain patients. However, it is necessary to conduct further cross-validation studies using patients from a wide variety of treatment settings.

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Low back pain patients' responses to the McGill Pain Questionnaire were factor analyzed using a method of factor extraction which, relative to the procedures employed in previous investigations, minimized distortion of the factor solution. Four factors were found which accounted for 51% of the total variance. Three of the factors were composed solely of sensory, affective and evaluative descriptor subclasses, respectively. The fourth was defined by both sensory and affective subclasses. The results provided strong support for the continued use of the sensory, affective and evaluative pain rating indices. Suggestions regarding replication of the present study and use of pain language factor scales for predictive purposes were discussed.