Validation of the Persian version of the computer ergonomics knowledge assessment questionnaire among frequent computer users

This study aimed to assess the validity and reliability of the Persian version of the Computer Ergonomics Knowledge Assessment Questionnaire (CEKAQ), designed to evaluate ergonomic knowledge among frequent computer users. The original English questionnaire was translated and culturally adapted following standardized guidelines. Content validity was evaluated through expert review using the Content Validity Ratio (CVR) and Content Validity Index (CVI); 12 items with low CVR were removed, and the remaining 23 items achieved a CVI of 0.99. Reliability was assessed via test-retest with 20 users, using the Intraclass Correlation Coefficient (ICC). Construct validity was examined through exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) on responses from 328 university students. The ICC was 0.813 (p < 0.001), indicating acceptable test-retest reliability. Factor analysis led to the removal of four items with low factor loadings (< 0.3), resulting in a final 19-item version that explained 28.4% of the total variance. CFA confirmed this unidimensional structure with robust fit indices (e.g., CFI = 0.931, RMSEA = 0.039). Internal consistency was acceptable (KR-20 = 0.759). The 19-item Persian CEKAQ demonstrated good content validity, acceptable reliability, and confirmed construct validity. It is a suitable tool for assessing ergonomic knowledge among computer users. Further refinement is recommended by expanding item content and diversifying the study population to enhance construct coverage.