Research report: PDF OnlyThe McGill pain questionnaire reconsidered: Confirming the factor structure and examining appropriate usesTurk, Dennis C.2,*; Rudy, Thomas E.**; Salovey, Peter*Author Information aDepartment of Psychology, P.O. Box 11A, Yale University, New Haven, CT 06520 U.S.A. bWest Haven V.A. Medical Center, West Haven, CTU.S.A. 2Requests for reprints should be sent to Dennis C. Turk at the above mentioned address. Submitted March 12, 1984; accepted November 21, 1984. ☆ This research was supported by a Veterans Administration Merit Review Grant. Pain: April 1985 - Volume 21 - Issue 4 - p 385-397 doi: 10.1016/0304-3959(85)90167-8 Buy Metrics Abstract A major problem in the understanding and psychological treatment of chronic pain patients is the inadequacy of available assessment procedures. Currently, the most frequently used instrument is the Pain Rating Index (PRI) of the McGill Pain Questionnaire, designed to assess 3 components of pain (i.e., sensory, affective and evaluative) postulated by the Gate Control Theory. The PRI has been used in many studies to make differential diagnoses, to describe different groups of pain patients and to identify the factor composition of the instrument itself. To date, however, no study has appropriately tested the a priori structure of the PRI or cross-validated it. Confirmatory factor analytic procedures employed in the present study supported Melzack's postulated tri-component structure of the PRI in 2 diverse samples of pain patients from different hospitals. However, the 3 components were found to be highly intercorrelated. Subsequent analyses revealed that the 3 components of the PRI do not display adequate discriminant validity. The current use of 3 subscales to establish differential diagnoses or patterns of different pain syndromes may lead to inappropriate classification and treatment decisions. The major conclusion of these findings is that use of only the total score of the PRI is appropriate for pain assessment. © Lippincott-Raven Publishers.