Valerie Williams1, Theresa Coles2, Ari Gnanasakthy2, Carla Demuro2, Stuart Yarr2, Nicole Williams2, Linda Lowes3, Lindsay Alfano3, Brian Tseng4. 1. RTI Health Solutions, 200 Park Offices Drive, Research Triangle Park, North Carolina, 27709, USA. vwilliams@rti.org. 2. RTI Health Solutions, 200 Park Offices Drive, Research Triangle Park, North Carolina, 27709, USA. 3. Nationwide Children's Hospital, Columbus, Ohio, USA. 4. Novartis Pharmaceuticals, East Hanover, New Jersey, USA.
Abstract
INTRODUCTION: To assess self-reported physical functioning in patients with sporadic inclusion body myositis (sIBM), the sIBM Physical Functioning Assessment (sIFA) was developed. This research establishes the validity, reliability, and responsiveness of the sIFA in patients with sIBM. METHODS: Data from 3 small, noninterventional, observational studies were analyzed. Several measures of physical function were included to assess validity. Reliability (Cronbach alpha, test-retest intraclass correlations), construct validity (correlations, analyses of variance), and responsiveness (effect size estimates) were evaluated. RESULTS: Cronbach alphas (range = 0.86-0.91) and test-retest reliability (0.91) were highly satisfactory. Correlations with other measures provided evidence of convergent validity. sIBM patients able to walk without assistive devices scored significantly better on the sIFA (means = 36.0-47.05) than those who required power mobility or wheelchairs (means = 54.9-71.5), demonstrating the discriminating ability of the sIFA. Effect size estimates of responsiveness suggested mild functional progression. CONCLUSIONS: Psychometric analyses of the sIFA demonstrate satisfactory reliability, validity, and responsiveness. Muscle Nerve 54: 658-665, 2016.
INTRODUCTION: To assess self-reported physical functioning in patients with sporadic inclusion body myositis (sIBM), the sIBM Physical Functioning Assessment (sIFA) was developed. This research establishes the validity, reliability, and responsiveness of the sIFA in patients with sIBM. METHODS: Data from 3 small, noninterventional, observational studies were analyzed. Several measures of physical function were included to assess validity. Reliability (Cronbach alpha, test-retest intraclass correlations), construct validity (correlations, analyses of variance), and responsiveness (effect size estimates) were evaluated. RESULTS: Cronbach alphas (range = 0.86-0.91) and test-retest reliability (0.91) were highly satisfactory. Correlations with other measures provided evidence of convergent validity. sIBM patients able to walk without assistive devices scored significantly better on the sIFA (means = 36.0-47.05) than those who required power mobility or wheelchairs (means = 54.9-71.5), demonstrating the discriminating ability of the sIFA. Effect size estimates of responsiveness suggested mild functional progression. CONCLUSIONS: Psychometric analyses of the sIFA demonstrate satisfactory reliability, validity, and responsiveness. Muscle Nerve 54: 658-665, 2016.
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