**2. Materials and Methods**

The survey was designed according to a study conducted in a Chinese university [22], the Generalized Anxiety Disorder 7-Item Scale (GAD-7) [23] and the guiding principles of emergent psychological crisis intervention in COVID-19 [24]. Information such as age, gender, grade, health state, residence, annual household income and grade were collected using single item measures. Anxiety was obtained according to GAD-7 and Cronbach- s alpha coefficient was 0.901. Invulnerability, conformity, insensitivity, rebelliousness and bravado were measured by a Likert-type scale of 1–4; "1 = Never or very rare", "2 = Sometimes", "3 = Often" and "4 = Very often or always". The risk level of the living region was decided according to the data from the National Health Commission of the People's Republic of China (a high risk region ≥ 50 confirmed cases in two weeks; the moderate risk region had < 50 confirmed cases and had new confirmed cases in two weeks; the mild risk region had no new confirmed case in two weeks). The cross-sectional survey was carried out from 1 April to 1 June 2020. The Questionnaire Star (https://www.wjx.cn, accessed on 30 June 2020) was used as the platform of this survey. The participants were recruited from the Wuhan University of Science and Technology (WUST) and the website of the survey was shared in WeChat or a QQ group of the students of WUST. Before the survey, an electronic informed consent was signed online. The participants were informed that the survey was anonymous and they could reject the survey for any reason. The study was approved by the Ethics Committee of Wuhan University of Science and Technology

(protocol code 20200407, 4 February 2021). All data were analyzed by SPSS software and a one-way analysis of variance was applied to assess the significance of each factor.

#### **3. Results**
