Validation of the Greek version of the Child perceptions questionnaire (CPQ-GR8-10) for assessing oral health-related quality of life in 8-10-year-old children: A psychometric evaluation.

To develop and validate a Greek version of the Child Perceptions Questionnaire for children aged 8-10 (CPQ8-10) through a psychometric evaluation. The original CPQ 8-10 was translated using a standardized forwardbackward method. A pre-test with 20 children guided cultural adaptations. The final version (CPQ-GR8-10) was completed by 150 children aged 8-10 attending a university dental clinic. Reliability was assessed through internal consistency (Cronbach's α) and test-retest reliability (intraclass correlation coefficient, ICC). Structural validity was evaluated using confirmatory and exploratory factor analyses. Construct validity was evaluated via correlations with self-rated oral health and clinical indices (CPI, OHI-S, DMFT/dmft). Confirmatory factor analysis did not support the original four-factor structure. Exploratory factor analysis identified a proposed 21-item, twofactor solution. The CPQ-GR8-10 showed very high internal consistency (α = 0.98) and test-retest reliability (ICC = 0.99-1.00). Convergent validity was supported by strong correlations with global oral health ratings (ρ = 0.90-0.92). Concurrent validity was demonstrated through significant associations with clinical oral health indicators. The CPQ-GR8-10 appears to be a reliable and valid tool for assessing oral health-related quality of life in Greek children. Although the original four-factor structure was not supported, a proposed 21-item, two-factor solution demonstrated excellent psychometric performance in this sample. Nonetheless, the consistently high reliability coefficients may reflect redundancy and sample homogeneity. The proposed 21-item, twofactor structure should be confirmed in larger, independent samples before modification of the original questionnaire can be recommended.