Psychometrics Evaluation of the Persian Version of the Swedish Occupational Fatigue Inventory (SOFI), Cultural Adaptation and Reliability

Introduction: This study assessed the translation, cultural adaptation and reliability of the Persian version of Swedish Occupational Fatigue Inventory Questionnaire (SOFI). Methods: This cross-sectional study was conducted to evaluate the psychometric characteristics of the SOFI Questionnaire by performing reliability and cultural adaptation. Cultural adaptation was done based on the previous published guidelines and reliability of the SOFI was assessed by internal consistency and test–retest reliability. Testretest reliability was performed in the 50 nurses recorded at baseline and 3-7 days later. Internal consistency was assessed using Cronbach's-α. Results: Some minor changes were applied to the SOFI during the cultural adaptation process. An acceptable level of internal consistency (Cronbach's Alpha= 0.94) and test–retest reliability (ICC= 0.9) was obtained. Conclusion: The Persian version of the SOFI was proved to have sufficient levels of reliability for estimating occupational fatigue of Iranian nurses.