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Development and psychometric properties of a joint protection self-efficacy scale

Niedermann, K; Forster, A; Ciurea, A; Hammond, A; Uebelhart, D; de Bie, R


K Niedermann

A Forster

A Ciurea

D Uebelhart

R de Bie


Introduction: self-efficacy is one of the most powerful determinants of behaviour change. To increase effectiveness of joint protection (JP) education, it may be important to address perceptions of JP self-efficacy directly. The aim of this study was to develop a scale to measure JP self-efficacy (JP-SES) in people with rheumatoid arthritis (RA). Methods. Instrument development included item generation, construct validity, and reliability testing. Rasch analysis was applied to determine construct validity and the revised JP-SES was tested again to confirm validity and establish test–retest reliability and internal consistency. Results. A total of 46 items were generated by literature review, occupational therapists, and people with RA. After semi-structured interviews and field-testing with RA participants, a 26-item questionnaire draft was constructed and tested. Rasch analysis to determine construct validity reduced the JP-SES to 13 items with good overall fit values. Rasch analysis of confirmatory validity resulted in a final 10-item version of the JP-SES. Test–retest results supported the validity of the scale, with high internal consistency (a = 0.92) and good test–retest reliability (rs = 0.79; p < 0.001). Conclusions. The JP-SES is a valid and reliable scale to assess perceived ability of people with RA to apply JP methods. The JP-SES could help stimulate the use of efficacy-enhancing methods in JP education.


Niedermann, K., Forster, A., Ciurea, A., Hammond, A., Uebelhart, D., & de Bie, R. (2011). Development and psychometric properties of a joint protection self-efficacy scale. Scandinavian Journal of Occupational Therapy, 18(2), 143-152.

Journal Article Type Article
Publication Date Jun 1, 2011
Deposit Date Jun 8, 2011
Journal Scandinavian Journal of Occupational Therapy
Print ISSN 1103-8128
Publisher Informa Healthcare
Peer Reviewed Peer Reviewed
Volume 18
Issue 2
Pages 143-152
Keywords Joint protection, occupational therapy, Rasch analysis, rehabilitation, rheumatoid arthritis, self-efficacy, validation
Publisher URL