Table 2.

Comparison of the incidence of sleep disorders in participants of different demographic characteristics.

Variables		N	Sleep disorders n (%)	χ 2	p
Age (years)	≤25	267	138 (51.7)	6.971	0.031
	26-35	214	136 (63.6)
	>35	40	24 (60.0)
Ethnicity	Han	369	208 (56.4)	0.355	0.551
	Minority	152	90 (59.2)
Working years	<10 years	312	167 (53.3)	4.284	0.038
	~10 years	209	131 (62.7)
Educational level	Below bachelor's degree	106	60 (56.6)	0.019	0.890
	Bachelor degree or above	415	238 (57.3)
Professional titles	Primary	352	192 (54.4)	3.118	0.077
	Intermediate or above	169	106 (62.7)
Night shift frequency	≤3 times/month	131	39 (29.8)	53.771	<0.001
	>3 times/month	390	259 (66.4)
Marital status	Single	140	69 (49.3)	4.895	0.027
	Married	381	229 (60.1)