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

95%CI, 95% confidence interval; OR, odds ratio a Model 1, univariate model b 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 dimensions d 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 income Logistic regression results: odds ratios of prolonged sleep difficulties and 95% confidence intervals.