Table S1.

Prevalence of insomnia symptoms by age and region (or gender)

Age (years)	Insomnia symptoms			Age (years)	Insomnia symptoms
	Rural region % (95% CI)	Urban region % (95% CI)	Total % (95% CI)		Female % (95% CI)	Male % (95% CI)	Total % (95% CI)
<50 (n=3,119)	19.8 (18.0–21.5)	20.7 (18.4–23.1)	20.1 (18.7–21.5)	<50 (n=3,119)	20.8 (19.1–22.5)	18.7 (16.3–21.2)	20.1 (18.7–21.5)
≥50 (n=1,280)	25.6 (22.3–28.9)	28.4 (24.8–31.9)	27.0 (24.5–29.4)	≥50 (n=1,280)	30.1 (26.8–33.4)	22.6 (19.0–26.1)	27.0 (24.5–29.4)
Total (n=4,399)	21.2 (19.7–22.8)	23.4 (21.4–25.4)	22.1 (20.9–23.3)	Total (n=4,399)	23.2 (21.6–24.7)	20.1 (18.1–22.1)	22.1 (20.9–23.3)