ArticleThe Journal of rheumatology2021
Functional Index-3: A Valid and Reliable Functional Outcome Assessment Measure in Patients With Dermatomyositis and Polymyositis.
Article in The Journal of rheumatology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Efficacy and Safety of Subcutaneous Abatacept Plus Standard Treatment for Active Idiopathic Inflammatory Myopathy: Phase 3 Randomized Controlled Trial.Arthritis & rheumatology (Hoboken, N.J.) · 2025Trial
- High-intensity resistance training in patients with myositis - 1-year follow-up on a randomised controlled trial.Rheumatology international · 2025Trial
- High-intensity resistance training improves quality of life, muscle endurance and strength in patients with myositis: a randomised controlled trial.Rheumatology international · 2024Trial
- Toward digitally supported self-assessment of patients with idiopathic inflammatory myopathies.Arthritis research & therapy · 2025Article
- Digital Approaches for Myositis.Current rheumatology reports · 2023Review
- Assessment of Physical Activity and Muscle Function in Adult Inflammatory Myopathies.Current rheumatology reports · 2022Review
- Exercise as a multi-modal disease-modifying medicine in systemic sclerosis: An introduction by The Global Fellowship on Rehabilitation and Exercise in Systemic Sclerosis (G-FoRSS).Best practice & research. Clinical rheumatology · 2021Review
- High-intensity strength training in patients with idiopathic inflammatory myopathies: a randomised controlled trial protocol.BMJ open · 2021Article
- Health-Related Quality of Life (HRQoL) in Sarcoidosis: Diagnosis, Management, and Health Outcomes.Diagnostics (Basel, Switzerland) · 2021Review
- Patient insights on living with idiopathic inflammatory myopathy and the limitations of disease activity measurement methods - a qualitative study.BMC rheumatology · 2020Article
Corrections and comments
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Authors and funding
6 authors.
Funding
Abstract
objectivePatients 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, and intra- and interrater reliability.
methodsA dataset 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 intrarater reliability of FI-3 were tested on 43 DM and PM patients at 2 rheumatology centers. Interrater reliability was tested in 25 patients. The construct validity was compared with the Myositis Activities Profile (MAP), Health Assessment Questionnaire (HAQ), and Borg CR-10 using Spearman correlation coefficient.
resultsSpearman correlation coefficients of 63 patients performing FI-3 revealed moderate to high correlations between shoulder flexion and hip flexion tasks and similar correlations with MAP and HAQ scores; there were lower correlations for neck flexion task. All FI-3 tasks had very low to moderate correlations with the Borg scale. Intraclass correlation coefficients (ICC) of FI-3 tasks for intrarater reliability (n = 25) were moderate to good (0.88-0.98). ICC of FI-3 tasks for interrater reliability (n = 17) were fair to good (range 0.83-0.96).
conclusionThe FI-3 is an efficient and valid method for clinically assessing muscle endurance in DM and PM patients. FI-3 construct validity is supported by the significant correlations between functional tasks and the MAP, HAQ, and Borg CR-10 scores.
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