Characteristics of respondents and prevalence of prolonged sleep difficulties.

Prolonged sleep difficulties: sleep difficulties that lasted over 1 monthn: number of respondentsa The number in each category was divided by the total number of participants (2463)b Prevalence of prolonged sleep difficulties in each categoryc [mean ± standard deviation]d “Other” includes public livelihood assistance, unemployment allowance, and no regular income.Characteristics of respondents and prevalence of prolonged sleep difficulties.