Factors associated with the mental health of back-to-Wuhan university students based on quantile regression model during the COVID-19 period

Table 2 The distribution characteristics of mental health variables

	Mean	Standard deviation	Median	Mode	Skewness	Kurtosis	Normal-proportion	Severe- proportion	Normality
GAD-7	4.36	4.3	4	0	1.04	0.88	0.56	0.05	< 0.01**
PHQ-7	5.18	5.18	4	0	1.12	1.1	0.53	0.06	< 0.01**
ISI-7	6.76	5.49	6	0	0.87	0.31	0.62	0.11	< 0.01**
IES-R	8.75	5.01	8	8	0.39	0.11	0.42	0.13	< 0.01**

Note. GAD-7 7-item General Anxiety Disorder Scale, PHQ-9 9-item Patient Health Questionnaire (depression), ISI-7 7-item Insomnia Severity Index Scale, IES-R the Impact of Event Scale–Revised (distress)
^**P < 0.01 *P < 0.05

ISSN: 1471-244X