Maher Institute Inc Iranian Journal of Neurodevelopmental Disorders 3115-848X 5 2026 05 01 Explaining Psychological Quality of Life Based on Psychological Capital and Meaning in Life with the Mediating Role of Hope Explaining Psychological Quality of Life Based on Psychological Capital and Meaning in Life with the Mediating Role of Hope 1 10 EN Leila Mohammadzadeh Nasrabadi MA, Department Of Positive Psychology, Central Tehran Branch, Islamic Azad University, Tehran, Iran Journal Article 2025 11 01 <p><strong>Purpose: </strong>The present study aimed to explain psychological quality of life based on psychological capital and meaning in life, with the mediating role of hope.</p> <p><strong>Methods and Materials: </strong>This study employed a descriptive-correlational design using structural equation modeling. The statistical population consisted of adults residing in Tehran, from whom 384 participants were selected through multistage cluster sampling based on G*Power estimation. Data were collected using standardized instruments including the World Health Organization Quality of Life-BREF (psychological domain), the Psychological Capital Questionnaire (Luthans et al., 2007), the Meaning in Life Questionnaire (Steger et al., 2006), and the Adult Hope Scale (Snyder et al., 1991). Data analysis was conducted using SPSS-27 and AMOS-24. Preliminary analyses included descriptive statistics and Pearson correlations, followed by structural equation modeling to test direct and indirect relationships. Model fit was evaluated using indices such as CFI, TLI, and RMSEA, and indirect effects were examined using bootstrap resampling.</p> <p><strong>Finding: </strong>The results indicated that psychological capital had a significant positive effect on hope (β = 0.63, p &lt; 0.001) and psychological quality of life (β = 0.29, p &lt; 0.001). Meaning in life also significantly predicted hope (β = 0.41, p &lt; 0.001) and psychological quality of life (β = 0.24, p &lt; 0.001). Hope had a strong positive effect on psychological quality of life (β = 0.52, p &lt; 0.001). Bootstrap analysis confirmed the significance of indirect effects, indicating that hope partially mediated the relationships between psychological capital and quality of life (β = 0.33, p &lt; 0.001) and between meaning in life and quality of life (β = 0.21, p &lt; 0.001). The proposed model demonstrated good fit (χ²/df = 2.34, CFI = 0.95, TLI = 0.94, RMSEA = 0.059).</p> <p><strong>Conclusion: </strong>The findings suggest that psychological capital and meaning in life are significant predictors of psychological quality of life, both directly and indirectly through hope. Hope functions as a key mediating mechanism that translates psychological and existential resources into enhanced well-being.</p> https://www.maherpub.com/index.php/jndd/article/download/793/651