Table 3.

Number, % and OR of SA by sleep problems in boys: 24 schools study, China.

Sleep problems	n (%)	Unadjusted analysis		Adjusted analysisa		Adjusted analysisb
		OR (95%CI)	P-value	OR (95%CI)	P-value	OR (95% CI)	P-value
Weekday sleep duration
<6 h	107 (14.8)	4.62 (3.54–6.01)	<0.001	3.50 (2.65–4.63)	<0.001	2.75 (2.02–3.75)	<0.001
6–8 h	143 (3.6)	1.0		1.0		1.0
8–10 h	86 (3.7)	1.03 (0.78–1.35)	0.850	1.39 (1.03–1.86)	0.031	1.52 (1.12–2.06)	0.008
≥10 h	35 (11.1)	3.33 (2.26–4.92)	<0.001	3.59 (2.36–5.46)	<0.001	3.82 (2.44–5.98)	<0.001
Weekend sleep duration
<6 h	54 (13.4)	4.09 (2.90–5.77)	<0.001	2.52 (1.74–3.65)	<0.001	1.40 (0.92–2.12)	0.117
6–8 h	73 (6.5)	1.82 (1.35–2.47)	<0.001	1.58 (1.16–2.17)	0.004	1.38 (0.99–1.90)	0.055
8–10 h	112 (3.7)	1.0		1.0		1.0
≥10 h	132 (4.9)	1.35 (1.04–1.74)	0.023	1.26 (0.96–1.65)	0.092	0.99 (0.75–1.32)	0.970
Midday nap (day/week)
None	118 (5.2)	1.04 (0.82–1.31)	0.751	1.24 (0.95–1.62)	0.123	1.15 (0.87–1.51)	0.332
Sometime	52 (5.2)	1.04 (0.76–1.42)	0.818	1.18 (0.85–1.64)	0.334	1.12 (0.80–1.58)	0.511
Often	201 (5.0)	1.0		1.0		1.0
Insomnia
None	106 (3.0)	1.0		1.0		1.0
Sometime	130 (5.0)	1.69 (1.30–2.19)	<0.001	1.45 (1.11–1.91)	0.007	1.35 (1.00–1.83)	0.053
Often	135 (10.9)	3.89 (2.99–5.06)	<0.001	2.33 (1.76–3.08)	<0.001	1.60 (1.15–2.22)	0.005
Nightmare
None	196 (3.4)	1.0		1.0		1.0
Sometime	108 (8.2)	2.50 (1.96–3.19)	<0.001	1.92 (1.49–2.47)	<0.001	1.73 (1.31–2.28)	<0.001
Often	67 (22.2)	8.00 (4.96–8.91)	<0.001	4.22 (3.03–5.88)	<0.001	2.63 (1.79–3.85)	<0.001
Non-restorative sleep
None	135 (3.3)	1.0		1.0		1.0
Sometime	113 (5.2)	1.60 (1.24–2.06)	<0.001	1.22 (0.94–1.60)	0.141	1.01 (0.75–1.37)	0.925
Often	123 (11.5)	3.78 (2.93–4.88)	<0.001	1.88 (1.42–2.48)	<0.001	1.04 (0.74–1.46)	0.816
Daytime fatigue
None	43 (3.9)	1.0		1.0		1.0
Sometime	155 (3.5)	0.91 (0.64–1.28)	0.585	0.89 (0.62–1.27)	0.527	0.97 (0.66–1.42)	0.863
Often	173 (9.5)	2.58 (1.83–3.64)	<0.001	1.48 (1.03–2.14)	0.035	1.18 (0.79–1.79)	0.419
Sleep beliefs
High	170 (8.3)	2.19 (1.66–2.89)	<0.001	1.23 (0.91–1.66)	0.177	1.03 (0.75–1.41)	0.855
Moderate	125 (3.7)	0.93 (0.69–1.24)	0.602	0.76 (0.56–1.03)	0.074	0.80 (0.58–1.10)	0.172
Low	76 (4.0)	1.0		1.0		1.0

SA, suicidal attempt.

^aAdjusted for age, regional areas, urban/rurality, parent's education level, economic status of family, psychological symptoms.

^bAdjusted for age, regional areas, urban/rurality, parent's education level, economic status of family, psychological symptoms, all sleep variables. P < 0.05 were in bold.