Table 1.

Characteristics of the participants

Items	All, n (%)/mean (SD)	Junior school students, n (%)/mean (SD)	High school students, n (%)/mean (SD)
Gender
Male	528 (51.5)	239 (48.5)	289 (54.3)
Female	497 (48.5)	254 (51.5)	243 (45.7)
Age	15.56 (1.89)	13.93 (1.12)	17.08 (.99)
Grade
First grade	371 (36.2)	166 (33.7)	205 (38.5)
Second grade	319 (31.1)	155 (31.4)	164 (30.8)
Third grade	335 (32.7)	172 (34.9)	163 (30.6)
Father's education level
Primary	97 (9.5)	16 (3.2)	81 (15.2)
High school	717 (70.0)	312 (63.3)	405 (76.1)
College/university	168 (16.4)	122 (24.7)	46 (8.6)
Graduate school	43 (4.2)	43 (8.7)	0 (.0)
Mother's education level
Primary	159 (15.5)	23 (4.7)	136 (25.6)
High school	699 (68.2)	336 (68.2)	363 (68.2)
College/university	155 (15.1)	122 (24.7)	33 (6.2)
Graduate school	12 (1.2)	12 (2.4)	0 (.0)
Annual household income
＜50,000	374 (36.5)	99 (20.1)	275 (51.7)
50,000–200,000	495 (48.3)	257 (52.1)	238 (44.7)
200,000–50,000	127 (12.4)	116 (23.5)	11 (2.1)
＞500,000	29 (2.8)	21 (4.3)	8 (1.5)
Do you have siblings?
Yes	830 (81.0)	342 (69.4)	488 (91.7)
No	195 (19.0)	151 (30.6)	44 (8.3)
Is there a peer partner around you?
Yes	826 (80.6)	420 (85.2)	406 (76.3)
No	199 (19.4)	73 (14.8)	126 (23.7)
Area during the COVID-19 pandemic
Hubei Province	6 (.6)	5 (1.0)	1 (.2)
Mainland China (except Hubei)	1,014 (98.9)	485 (98.4)	529 (99.4)
Hong Kong/Macao SAR, China	2 (.2)	1 (.2)	1 (.2)
Foreign countries	2 (.4)	1 (.2)	3 (.3)
Any confirmed/suspected cases with COVID-19 around you?
Yes	12 (1.2)	10 (2.0)	2 (.4)
No	1,013 (98.8)	483 (98.0)	530 (99.6)
Are your parents a frontline antiepidemic person?
Yes	14 (1.4)	8 (1.6)	6 (1.1)
No	1,011 (98.6)	485 (98.4)	526 (98.9)