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Abstract: Psychometric evaluation of the Pain Anxiety Symptoms Scale (PASS) in chronic pain patients

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J Behav Med. 2004 Apr;27(2):167-83. Roelofs J, McCracken L, Peters ML, Crombez G, van Breukelen G, Vlaeyen JW. Department of Medical, Clinical and Experimental Psychology, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands. j.roelofs@dep.unimaas.nl

This study examined psychometric properties of the Pain Anxiety Symptoms Scale (PASS), a measure of pain-related fear. A recently developed shortened version of the PASS, the PASS-20, was also investigated. Previously reported factor structures of the PASS were tested by means of confirmatory factor analysis. Results indicated that all models fitted adequately but that a five-factor solution fitted slightly better compared to the other models tested. The four-factor solution of the PASS-20 was tested by means of confirmatory factor analysis and results indicated adequate fit. Moreover, the four-factor solution of the PASS-20 was invariant among fibromyalgia and low-back pain patients. Convergent validity of the original PASS and the PASS-20 was good and internal consistency reliability adequate to excellent.

The suitability of the original PASS and the PASS-20 are discussed and directions for future research are provided. PMID: 15171105 [PubMed – in process]

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