Table 4.

Prevalence of insomnia symptoms by age groups

	Age groups
	<25		25–34		35–44		45–54		55–64		>=65		Total
	%	[95% CI]	%	[95% CI]	%	[95% CI]	%	[95% CI]	%	[95% CI]	%	[95% CI]	%	[95% CI]
Difficulty initiating sleepa	10.4	[9.5–11.3]	7.9	[7.2–8.7]	8.5	[10.0–12.0]	8.5	[10.0–12.0]	11.0	[10.0–12.0]	13.1	[11.9–16.0]	10.9	[10.5–11.2]
Difficulty maintaining sleepa	12.4	[11.5–13.4]	15.2	[14.2–16.3]	18.8	[21.8–24.5]	23.1	[21.8–24.5]	33.3	[31.7–34.9]	38.7	[37.3–40.1]	23.1	[22.6–23.7]
Early morning awakeningsa	9.1	[83–10.0]	8.6	[7.8–9.4]	10.4	[13.3–15.5]	14.4	[13.3–15.5]	16.3	[15.1–17.6]	16.7	[15.6–17.8]	12.3	[11.9–12.7]
Non-restorative sleepa	12.1	[11.1–13.0]	11.5	[10.6–12.4]	11.5	[10.9–13.0]	11.9	[10.9–13.0]	9.9	[8.9–10.9]	9.4	[8.5–10.2]	11.1	10.7–11.5
Total insomnia symptomsa	26.6	[25.3–27.9]	27.2	25.9–28.4]	29.6	[28.2–30.9]	34.4	[32.9–36.0]	42.0	[40.3–43.7]	47.7	[46.3–49.1]	34.5	[33.7–34.8]

^ap<0.0001 between age groups