Validation of the Self-Efficacy for Managing Chronic Disease Scale: A Scleroderma Patient-Centered Intervention Network Cohort Study

Kira E. Riehm, Linda Kwakkenbos, Marie Eve Carrier, Susan J. Bartlett, Vanessa L. Malcarne, Luc Mouthon, Warren R. Nielson, Serge Poiraudeau, Karen Nielsen, Murray Baron, Tracy Frech, Marie Hudson, Janet Pope, Maureen Sauve, Maria E. Suarez-Almazor, Fredrick M. Wigley, Brett D. Thombs, Dan Furst, Karen Gottesman, Maureen D. MayesRobert Riggs, Frank van den Hoogen, Shervin Assassi, Isabelle Boutron, Angela Costa Maia, Ghassan El-Baalbaki, Carolyn Ells, Cornelia H M van den Ende, Kim Fligelstone, Catherine Fortune, Dominique Godard, Daphna Harel, Ann Impens, Yeona Jang, Sindhu R. Johnson, Ann Tyrell Kennedy, Annett Körner, Catarina Leite, Carlo Marra, Janet L. Poole, Alexandra Portales, Tatiana Sofia Rodriguez Reyna, Anne A. Schouffoer, Russell J. Steele, Joep Welling, Durhane Wong-Rieger, Alexandra Albert, Guylaine Arsenault, Patricia Carreira, Lorinda Chung, the Scleroderma Patient-Centered Intervention Network Investigators

Research output: Contribution to journalArticlepeer-review


Objective: Self-management programs for patients with chronic illnesses, including rheumatic diseases, seek to enhance self-efficacy for performing health management behaviors. No measure of self-efficacy has been validated for patients with systemic sclerosis (SSc; scleroderma). The objective of this study was to assess the validity and internal consistency reliability of the Self-Efficacy for Managing Chronic Disease (SEMCD) scale in SSc. Methods: English-speaking SSc patients enrolled in the Scleroderma Patient-centered Intervention Network Cohort who completed the SEMCD scale at their baseline assessment between March 2014 and June 2015 were included. Patients were enrolled from 21 sites in Canada, the US, and the UK. Confirmatory factor analysis (CFA) was used to evaluate the factor structure of the SEMCD scale. Cronbach's alpha was calculated to assess internal consistency reliability. Hypotheses on the direction and magnitude of Pearson's correlations with psychological and physical outcome measures were formulated and tested to examine convergent validity. Results: A total of 553 patients were included. CFA supported the single-factor structure of the SEMCD scale (Tucker Lewis Index = 0.99, comparative fit index = 0.99, root mean square error of approximation = 0.10). Internal consistency was high (α = 0.93), and correlations with measures of psychological and physical functioning were moderate to large (|r| = 0.48–0.67, P < 0.001), confirming study hypotheses. Conclusion: Scores from the SEMCD scale are valid for measuring self-efficacy in patients with SSc, and results support using the scale as an outcome measure to evaluate the effectiveness of self-management programs in SSc.

Original languageEnglish (US)
Pages (from-to)1195-1200
Number of pages6
JournalArthritis and Rheumatism
Issue number8
StatePublished - Aug 1 2016

ASJC Scopus subject areas

  • Rheumatology


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