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The Shoulder Pain and Disability Index (SPADI) is a measuring instrument for pain and disability in patients with shoulder dysfunction. However, its structure is controversial (ie, 1 or 2 domains). To investigate the structural validity of the Brazilian version of the SPADI in patients with chronic shoulder pain. Cross-sectional study. Brazilian Portuguese speakers of both genders aged 18 years or older with shoulder pain for at least 90 days (chronic) were included in this study. The structure of the SPADI was assessed by means of expl
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