Translation, validation, and reliability of the Greek version of the Arthritis Self-Efficacy Scale

Abstract

Purpose The Arthritis Self-Efficacy Scale (ASES) has been administered to patients with arthritis in order to assess their self-efficacy. This study aimed to evaluate the psychometric properties and the responsiveness of the Greek version of ASES (ASES-GR). Materials and methods A sample of 100 patients with arthritis (11 men, 89 women with a mean age 57.72 years) completed the ASES-GR. Internal consistency, test–retest reliability, responsiveness, and concurrent validity were estimated and compared to other valid and culturally adapted scales. The factorial validity was also examined using Exploratory Factor Analysis (EFA). Results EFA revealed a four factor structure with four eigenvalues >1 (1.045–10.421) explaining the 74.97% of the total variance. The factor loadings ranged from 0.561 to 0.837 and the communalities from 0.614 to 0.835. The concurrent validity of the instrument was confirmed. The ASES-GR showed high internal consistency (Cronbach’s α from 0.876 to 0.927 for each factor and 0.950 for the whole scale), excellent test–retest reliability (ICC ranged from 0.93 to 0.97) and responsiveness (RΟC: AUC 0.86–0.97). This is the first study assessing the responsiveness of ASES. Conclusions The ASES-GR has acceptable psychometric properties and is a reliable, valid, and responsive instrument to assess Greek patients with arthritis.