https://www.selleckchem.com/
OBJECTIVE Patients with dermatomyositis (DM) and polymyositis (PM) have reduced muscle endurance. The aim of this study was to streamline the Functional Index-2 (FI-2) by developing the Functional Index-3 (FI-3) and to evaluate its measurement properties, content and construct validity, intra- and inter-rater reliability. METHODS A data set of the previously performed and validated FI-2 (n=63) was analyzed for internal redundancy, floor and ceiling effects. The content of the FI-2 was revised into the FI-3. Construct validity and intra-rater reliability of
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