Logistic regression results: odds ratios of prolonged sleep difficulties and 95% confidence intervals.

95%CI, 95% confidence interval; OR, odds ratioa Model 1, univariate modelb Model 2, multivariate model in which social support was rated dichotomously (having any social support or not)c Model 3, multivariate model in which social support was categorized into three dimensionsd The odds ratio reflects the change in the odds of sleep difficulties per 10-year increase in age.e “Other” includes public livelihood assistance, unemployment allowance, and no regular incomeLogistic regression results: odds ratios of prolonged sleep difficulties and 95% confidence intervals.