The association between sleep quality and quality of life: a population-based study

ObjectivesThis study aimed to evaluate the association between sleep quality and quality of life (QoL).MethodsThis cross-sectional study included 225,541 adults (101,133 men, 124,408 women) who participated in the 2018 Korean Community Health Survey. Multiple sociodemographic and psychosocial variables were evaluated and compared between participants with poor (n = 67,619) and good sleep quality (n = 157,922); sleep quality was subjectively determined using the Pittsburgh Sleep Quality Index (PSQI). The EuroQol five-dimension (EQ-5D) index scores were adjusted for multiple confounding factors and compared between the good and poor sleep quality groups. A logistic regression analysis was used to identify determinants of the lowest quartile of QoL.ResultsThe mean EQ-5D index scores were significantly lower in the poor sleep quality group (score 0.85) than in the good sleep quality group (score 0.92; p < 0.001). The multivariate odds ratio (OR) for the lowest quartile of the EQ-5D index scores in the poor sleep quality group versus that in the good sleep quality group was 1.95 (95% confidence interval [CI], 1.89–2.00). Participants with poor sleep quality were more likely than those with good sleep quality to have some or severe problems with physical activity (OR, 1.46; 95% CI, 1.41–1.51), self-control (OR, 1.35; 95% CI, 1.29–1.42), daily activity (OR, 1.44; 95% CI, 1.39–1.50), pain (OR, 1.81; 95% CI, 1.77–1.86), and anxiety/depression (OR, 2.24; 95% CI, 2.17–2.31).ConclusionPoor sleep quality is associated with impaired QoL, particularly if some or severe problems with anxiety/depression are present.