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The Myositis Activities Profile -- initial validation for assessment of polymyositis/dermatomyositis in the USA.

Publication ,  Journal Article
Alexanderson, H; Reed, AM; Ytterberg, SR
Published in: J Rheumatol
November 2012

OBJECTIVE: To evaluate some measurement properties of the Myositis Activities Profile (MAP) in adult patients with polymyositis (PM) and dermatomyositis (DM) in the United States. METHODS: To assess content validity, patients with PM/DM rated difficulty and importance of items of the MAP using a visual analog scale (VAS), range 0-10. For construct validity, consecutive patients with PM/DM performed the 6-item core set for disease activity including the manual muscle test (MMT) and the Health Assessment Questionnaire (HAQ), the Functional Index-2 (FI-2; muscle endurance), and the MAP plus disease effect on well-being on a VAS. Item fit within subscales was analyzed by Cronbach's alpha. Patients with stable disease activity filled out the MAP again 1 week later. RESULTS: The median combined difficulty and importance, 0-10, of the 31 items was 5.00 (range 2.10-5.95). One item was added, giving a 32-item MAP. Correlations between the median of subscales/single items of the MAP and the HAQ and disease effect on well-being were r(s) = 0.69 and r(s) = 0.68, respectively, with lower correlations to the MMT (r(s) = -0.35), and the FI-2 (r(s) = -0.29 to -0.47) and disease activity measures (r(s) = 0.36-0.41). Cronbach's alpha coefficients for the 4 subscales varied between 0.85 and 0.95. Weighted kappa coefficients (K(w)) ranged between 0.77 and 0.93 for the 4 subscales and between 0.74 and 0.83 for the 4 single items without systematic variations (p > 0.05). CONCLUSION: This initial validation of the MAP indicates promising measurement properties for assessing limitations in activities of daily living and participation in patients with PM/DM in the United States.

Duke Scholars

Published In

J Rheumatol

DOI

EISSN

1499-2752

Publication Date

November 2012

Volume

39

Issue

11

Start / End Page

2134 / 2141

Location

Canada

Related Subject Headings

  • United States
  • Surveys and Questionnaires
  • Sickness Impact Profile
  • Severity of Illness Index
  • Reproducibility of Results
  • Polymyositis
  • Pain Measurement
  • Outcome Assessment, Health Care
  • Middle Aged
  • Male
 

Citation

APA
Chicago
ICMJE
MLA
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Alexanderson, H., Reed, A. M., & Ytterberg, S. R. (2012). The Myositis Activities Profile -- initial validation for assessment of polymyositis/dermatomyositis in the USA. J Rheumatol, 39(11), 2134–2141. https://doi.org/10.3899/jrheum.120504
Alexanderson, Helene, Ann M. Reed, and Steven R. Ytterberg. “The Myositis Activities Profile -- initial validation for assessment of polymyositis/dermatomyositis in the USA.J Rheumatol 39, no. 11 (November 2012): 2134–41. https://doi.org/10.3899/jrheum.120504.
Alexanderson H, Reed AM, Ytterberg SR. The Myositis Activities Profile -- initial validation for assessment of polymyositis/dermatomyositis in the USA. J Rheumatol. 2012 Nov;39(11):2134–41.
Alexanderson, Helene, et al. “The Myositis Activities Profile -- initial validation for assessment of polymyositis/dermatomyositis in the USA.J Rheumatol, vol. 39, no. 11, Nov. 2012, pp. 2134–41. Pubmed, doi:10.3899/jrheum.120504.
Alexanderson H, Reed AM, Ytterberg SR. The Myositis Activities Profile -- initial validation for assessment of polymyositis/dermatomyositis in the USA. J Rheumatol. 2012 Nov;39(11):2134–2141.

Published In

J Rheumatol

DOI

EISSN

1499-2752

Publication Date

November 2012

Volume

39

Issue

11

Start / End Page

2134 / 2141

Location

Canada

Related Subject Headings

  • United States
  • Surveys and Questionnaires
  • Sickness Impact Profile
  • Severity of Illness Index
  • Reproducibility of Results
  • Polymyositis
  • Pain Measurement
  • Outcome Assessment, Health Care
  • Middle Aged
  • Male