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Danish Version of 'The COPD Self-Efficacy Scale': Developing a 24-Item Version Using Rasch Analysis.
Christina Emme1, André Torre2, Thomas Kallemose2
1Department of Quality and Education, Bispebjerg and Frederiksberg University Hospital, Copenhagen, NV, Denmark.
Scandinavian Journal of Caring Sciences
|July 3, 2025
Summary
This study successfully shortened the COPD Self-Efficacy Scale (CSES) from 34 to 24 items. The revised scale maintains reliability and accuracy for assessing self-efficacy in chronic obstructive pulmonary disease patients.
Area of Science:
- Pulmonary Medicine
- Health Psychology
Background:
- Self-efficacy is a key modifiable factor for managing chronic obstructive pulmonary disease (COPD).
- The original 34-item COPD Self-Efficacy Scale (CSES) contained items not relevant to COPD patients.
- A shorter, more applicable version was needed.
Purpose of the Study:
- To develop a concise Danish version of the COPD Self-Efficacy Scale (CSES).
- To validate the psychometric properties and face validity of the shortened scale.
Main Methods:
- Rasch analysis was used to evaluate psychometric properties of the Danish CSES.
- A face validity test assessed the usability of the reduced scale.
Main Results:
- The scale was reduced to 24 items, comprising physical (12 items) and emotional (12 items) factors.
- Reliability and accuracy estimates remained acceptable after item reduction.
- Face validity testing confirmed the short version's manageable length and clear instructions.
Conclusions:
- The 24-item CSES retains acceptable psychometric properties.
- The shortened scale is comprehensible, relevant, and suitable for COPD patients.
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