Fig. 1

Hypothesized mediation model of relationships among drinking water quality, self-reported dyslipidemia, and mental status after controlling for individual and community covariates. Standardized path coefficients were presented. a. Relationship between drinking water quality and self-reported dyslipidemia. b. Association between self-reported dyslipidemia and mental status. c. Direct effect of drinking water quality on mental status. c’. Total effect of drinking water quality on mental status through self-reported dyslipidemia. *p < 0.05, **p < 0.01, ***p < 0.001