Background: The Short Form McGill Pain Questionnaire (SF-MPQ) is one of the most widely used instruments to\r\nassess pain. The aim of this study was to translate and culturally adapt the questionnaire for Farsi (the official\r\nlanguage of Iran) speakers in order to test its reliability and sensitivity.\r\nMethods: We followed Guillemin�s guidelines for cross-cultural adaption of health-related measures, which include\r\nforward-backward translations, expert committee meetings, and face validity testing in a pilot group. Subsequently,\r\nthe questionnaire was administered to a sample of 100 diverse chronic pain patients attending a tertiary pain and\r\nrehabilitation clinic. In order to evaluate test-retest reliability, patients completed the questionnaire in the morning\r\nand early evening of their first visit. Finally, patients were asked to complete the questionnaire for the third time\r\nafter completing a standardized treatment protocol three weeks later. Intraclass correlation coefficient (ICC) was\r\nused to evaluate reliability. We used principle component analysis to assess construct validity.\r\nResults: Ninety-two subjects completed the questionnaire both in the morning and in the evening of the first visit\r\n(test-retest reliability), and after three weeks (sensitivity to change). Eight patients who did not finish treatment\r\nprotocol were excluded from the study. Internal consistency was found by Cronbach�s alpha to be 0.951, 0.832 and\r\n0.840 for sensory, affective and total scores respectively. ICC resulted in 0.906 for sensory, 0.712 for affective and\r\n0.912 for total pain score. Item to subscale score correlations supported the convergent validity of each item to its\r\nhypothesized subscale. Correlations were observed to range from r2 = 0.202 to r2 = 0.739. Sensitivity or\r\nresponsiveness was evaluated by pair t-test, which exhibited a significant difference between pre- and posttreatment\r\nscores (p < 0.001).\r\nConclusion: The results of this study indicate that the Iranian version of the SF-MPQ is a reliable questionnaire and\r\nresponsive to changes in the subscale and total pain scores in Persian chronic pain patients over time.
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