Abstract
The Short-Form McGill Pain Questionnaire (SF-MPQ) is one of the most commonly used measures of the sensory, affective, and intensity dimensions of chronic pain. Like most pain measures, its psychometric validation is based on classical test theory methods. Little is known about the performance and scaling properties of the individual items that comprise the SF-MPQ, or of relative response patterns for chronic pain subgroups based upon age, gender, and pain duration. Item response theory (IRT) provides a basis for calibrating test items and trait scores on a common underlying scale, detecting varying response option interpretations, and evaluating potential differences in item function between subgroups.
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