Table 2.

Comparative analysis of students’ mental health in different periods ($\overline{x}\pm s$).

Sub-scale/General index	Norm (n = 12160)		Participants in this study (n = 472)		t	Effect Size	p
	Mean value	SD	Mean value	SD
Somatization	1.37	0.46	1.58	0.28	−15.78	−0.55	<0.001
Obsessive-compulsive disorder	1.66	0.58	1.73	0.32	−4.95	−0.15	<0.001
Interpersonal sensitivity	1.51	0.55	1.67	0.48	−7.07	−0.31	<0.001
Depression	1.45	0.53	1.48	0.37	−1.42	−0.07	0.056
Anxiety	1.40	0.48	1.55	0.33	−9.73	−0.36	<0.001
Hostility	1.48	0.57	1.50	0.31	−1.45	0.04	0.148
Phobic anxiety	1.23	0.39	1.54	0.36	−18.74	−0.83	<0.001
Paranoid ideation	1.41	0.50	1.54	0.41	−6.82	−0.28	<0.001
Psychoticism	1.34	0.44	1.39	0.30	−3.81	−0.13	0.090
General severity Index	1.51	0.58	1.55	0.10	−9.24	−0.10	<0.001