Table 1. The participants’ sociodemographic data and BDI scores in different sociodemographic variables.

	Group	N (%)	BDI score	F/t	P
Gender				0.82	0.412
	Male	2299 (50.2)	6.26±6.13
	Female	2283 (49.8)	6.41±5.94
Grade				2.425	0.064
	The first	1369 (29.9)	6.38±5.86
	The second	1206 (26.3)	6.52±6.39
	The third	1290 (28.2)	6.42±6.16
	The fourth	717 (15.6)	5.79±5.51
Major satisfaction				86.208	<0.001
	Yes	1816 (39.6)	5.27±5.36
	Moderate	2440 (53.3)	6.68±6.04
	No	326 (7.1)	9.71±7.84
Ethnicity				0.049	0.961
	Han	4258 (92.9)	6.33±6.06
	Others	324 (7.1)	6.35±5.81
Religion				4.745	<0.001
	No	4187 (91.4)	6.21±5.89
	Yes	395 (8.6)	7.71±7.30