Έλεγχος Αξιοπιστίας και Εγκυρότητας της Κλίμακας Αυτο-αποτελεσματικότητα Αρθρίτιδας σε ελληνικό πληθυσμό

Abstract

Introduction: Arthritis Self-Efficacy Scale (ASES) has been used widely to evaluate self-efficacy of patients with arthritis and it has been validated in many languages. The purpose of the study is to examine the reliability and validity of ASES-GR in Greek population with arthritis. Methods: ASES-GR was translated into Greek and then back-translated into English to assess content validity. The pre-final version was tested to investigate face validity. One hundred patients with arthritis were evaluated and 56 of them examined the test-retest reliability and responsiveness of ASES-GR. Pain Beliefs and Perceptions Inventory (PBPI), Visual Analogue Scale (VAS), Hospital Anxiety and Depression Scale (HADS), Short Form-McGill Pain Questionnaire (SFMPQ), Present Pain Index (PPI) and Short Form 36 Health Survey (SF-36) questionnaire were also applied to investigate the concurrent validity of the ASES-GR. Results: Exploratory Factor Analysis (EFA) determined the fourth factor structure of the ASES-GR with eigenvalues from 1.045 to 10.421 that explained 74.971% of the total variance. The communalities and the factor loadings of the 20 items ranged from 0.614 to 0.835 and 0.561 to 0.837, respectively. Significant negative correlations were found between the ASES-GR, SFMPQ, PPI, pain-VAS, HADS, Permanence and Constancy subscales of the PBPI (Spearman's rho -0.203 to -0.662, p < 0.05), while positive correlations were found between the ASES-GR and SF-36 (Spearman's rho 0.228 to 0.628, p < 0.05). Excellent test–retest reliability (ICC = 0.93 - 0.97), internal consistency (Cronbach α = 0.950, 0.876 - 0.927 for each factor) and reproducibility with ROC curve were demonstrated. Conclusion: ASES-GR was a reliable and valid instrument for the evaluation of Greek patients with arthritis.