Outcome measurement in functional somatic syndromes: SF-36 summary scores and some scales were not valid.
OBJECTIVE: This study aimed to test the validity of the 36-item Short-Form Health Survey (SF-36) scales and summaries in patients with severe functional somatic syndromes (FSS), such as fibromyalgia and irritable bowel syndrome. STUDY DESIGN AND SETTING: One hundred twenty patients with severe FSS enrolled in a randomized controlled trial filled in the SF-36 questionnaire. We tested for data quality, central scaling assumptions, and agreement with the conceptual model. RESULTS: Most SF-36 sc...Expand abstract
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