Table 2.

Participants’ quality of sleep and behavioral problems

	N	%
Subjective sleep quality
No-risk group (= 0)	182	30.9
Risk group (≥ 1)	407	69.1
Sleep latency
No-risk group (= 0)	325	56.3
Risk group (≥ 1)	252	43.7
Sleep duration
No-risk group (= 0)	540	91.4
Risk group (≥ 1)	51	8.6
Habitual sleep efficiency
No-risk group (= 0)	567	98.1
Risk group (≥ 1)	11	1.9
Sleep disturbances
No-risk group (= 0)	313	53.6
Risk group (≥ 1)	271	46.4
Use of sleeping medication
No-risk group (= 0)	591	99.3
Risk group (≥ 1)	4	0.7
Daytime dysfunction
No-risk group (= 0)	305	53.4
Risk group (≥ 1)	266	46.6
PSQI-global score
No-risk group (≤ 5)	499	94.5
Risk group (> 5)	29	5.5
Behavioral problems
No-risk group (< 17)	565	93.5
Risk group (≥ 17)	39	6.5

PSQI, Pittsburgh Sleep Quality Index; Sleep Disorder; PSQI-global score > 5; Strength and Difficulties Questionnaire; total difficulties score ≥ 17