Table 4. Association of the poor sleep quality and bullying behaviors.

Covariates		Reference	Adjusted OR	95% CI	p-value
Gender	Girl	Boy	1.32	1.23–1.41	<0.001
Grade	Junior	Senior	1.91	1.79–2.04	<0.001
Economic status	General	Good	1.04	0.97–1.14	0.211
	Bad		1.20	1.07–1.34	0.001
Academic pressure	Average	Low	1.18	1.06–1.32	0.002
	High		2.32	2.09–2.57	<0.001
Relationship with families	Average	Good	1.46	1.35–1.59	<0.001
	Bad		2.21	1.94–2.51	<0.001
Relationship with classmates	Average	Good	1.29	1.19–1.39	<0.001
	Bad		1.23	1.02–1.34	0.017
Relationship with teachers	Average	Good	1.31	1.22–1.41	<0.001
	Bad		2.00	1.73–2.30	<0.001
Smoking	Yes	No	1.67	1.47–1.91	<0.001
Bullying behavior	Victim	Neutral	2.05	1.81–2.32	<0.001
	Bully		2.30	1.85–2.86	<0.001
	Bully-Victim		2.58	2.20–3.03	<0.001

Notes: Adjusted for gender; grade; economic status; academic pressure; relationship with families, classmates, and teachers; and smoking