Psychometric properties of the Flourishing scale in Greek adult population

Abstract Background Well-being is a crucial indicator of individuals’ overall health, encompassing both psychological functioning and life satisfaction. The Flourishing Scale (FS), a brief yet comprehensive measure of well-being, is widely employed in both research and clinical settings to assess psychological flourishing. However, its test-retest reliability has not been evaluated in Greece. This study aims to examine the test-retest reliability and validity of the FS within the Greek context. Methods The psychometric properties of the FS were assessed in a sample of 200 Greek adult participants and in a randomly chosen and representative sample of adult population in Greece (data from the National Health Examination Survey: EMENO). Test-retest reliability was evaluated using Intraclass Correlation Coefficient (ICC), while Cronbach’s α and McDonald’s omega were employed to assess internal consistency. Both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) were conducted to explore and confirm the factor structure of the FS. Test-retest reliability, internal consistency (Cronbach’s alpha) and measurement invariance were further investigated across different demographic groups. Results FS demonstrated robust reliability in the Greek sample. The overall Cronbach’s α was 0.84, indicating good internal consistency, while McDonald’s omega total was 0.85, supporting the scale’s reliability. The ICC values for the FS total score and individual items were all above 0.6, suggesting a satisfactory level of repeatability, with several items achieving excellent levels of test-retest reliability. The results from both the EFA and CFA supported a one-factor model for the FS. Conclusions The Flourishing Scale (FS) is a reliable and valid instrument for assessing well-being in the Greek context. The scale exhibits strong psychometric properties, including high internal consistency and test-retest reliability, making it a valuable tool for both research and practical applications within this cultural context.