Table 1.

Sleep Quality and Quantity Over Child’s Age.

	18-30 Months			42–57 Months			69 Months			115 Months
	N	% [95% CI]		N	% [95% CI]		N	% [95% CI]		N	% [95% CI]
At least 1 sleep problem	21292	72.7	[72.1–73.3]	19477	79.7	[79.1–80.2]	8639	79.5	[78.6–80.3]	7790	75.1	[74.1–76.1]
Refuse going to bed	21242	35.9	[35.3–36.6]	19438	41.9	[41.2–42.5]	8621	37.8	[36.8–38.8]	7733	36.2	[35.2–37.3]
Woken up early	21223	52.2	[51.6–52.9]	19430	52.8	[52.1–53.5]	8580	45.7	[44.6–46.7]	7768	33.7	[32.6–34.8]
Difficulty going to sleep	21155	35.4	[34.7–36.0]	19413	38.7	[38.0–39.3]	8591	46.1	[45.1–47.2]	7741	52.5	[51.4–53.6]
Nightmares	21194	17.8	[17.3–18.4]	19330	35.5	[34.9–36.2]	8516	42.2	[41.2–43.3]	7626	29.1	[28.1–30.1]
Continusously wakes up	21173	33.4	[32.8–34.1]	19397	35.7	[35.0–36.4]	8570	32.3	[31.3–33.3]	7727	22.2	[21.3–23.2]
Waken up after few hours	21190	21.9	[21.4–22.5]	19385	14.8	[14.3–15.3]	8576	11.1	[10.5–11.8]	7722	6.5	[6.0–7.1]
Sleep quantity (mean hours)	20716	12.4	[12.4–12.4]	19129	11.5	[11.5–11.5]	8422	11.3	[11.3–11.3]	7801	10.4	[10.3–10.4]