This study aims to examine the effect of coworker relationship quality on life satisfaction among employees of Statistics Indonesia (BPS), with mental health as a mediating variable. Data were collected from a survey of 7,742 employees and analyzed using Structural Equation Modeling (SEM) with a two-step approach (Confirmatory Factor Analysis followed by full structural model estimation). The results show that coworker relationship quality has a positive and significant effect on life satisfaction, both directly and indirectly through mental health. Mental health is found to be a strong mediator in this relationship. These findings highlight the importance of social support in the workplace as a key factor in enhancing employee well-being, particularly in work contexts that are intensive and prone to psychological strain.
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