Table 3 Independent correlates of depression and anxiety of the whole sample (n = 13,440).

Variables	Depression				Anxiety
	P value	OR	95% CI for OR		P value	OR	95% CI for OR
	P value	OR	Lower	Upper	P value	OR	Lower	Upper
Second survey completion	<0.001	1.47	1.34	1.61	<0.001	1.64	1.48	1.81
Female	<0.001	1.21	1.12	1.31	<0.001	1.23	1.13	1.34
Senior secondary school	<0.001	1.41	1.29	1.54	<0.001	1.27	1.15	1.41
School type
Provincial key schools	Ref				Ref
Municipal key schools	0.551	0.95	0.80	1.13	0.064	0.84	0.69	1.01
Ordinary schools	0.336	1.08	0.92	1.26	0.003	0.78	0.66	0.92
Vocational schools	0.015	1.25	1.04	1.51	0.327	0.90	0.74	1.11
Major class	0.050	0.92	0.84	1.00	0.265	1.06	0.96	1.17
Sleep duration/day
<6 h	Ref				Ref
6–8 h	<0.001	0.45	0.37	0.53	<0.001	0.47	0.40	0.55
>8 h	<0.001	0.32	0.27	0.38	<0.001	0.34	0.28	0.40
Study duration/day
<4 h	Ref				Ref
4–8 h	0.023	0.87	0.78	0.98	0.098	0.89	0.78	1.02
>8 h	0.758	1.02	0.90	1.16	0.096	1.13	0.98	1.31
Exercise duration/day
<30 min	Ref				Ref
30–60 min	<0.001	0.64	0.60	0.70	<0.001	0.73	0.67	0.80
>60 min	<0.001	0.67	0.59	0.77	0.025	0.84	0.73	0.98
Change of study efficiency
Lower than before	Ref				Ref
About the same	<0.001	0.65	0.60	0.71	<0.001	0.72	0.65	0.79
Higher than before	<0.001	0.64	0.56	0.74	0.014	0.81	0.69	0.96
No. of COVID-19 cases at provincial level
10–99	Ref				Ref
100–999	0.159	0.62	0.32	1.21	0.008	0.41	0.22	0.80
1000–9999	0.028	0.47	0.24	0.92	0.001	0.31	0.16	0.60
>10,000	0.135	0.59	0.30	1.18	0.013	0.42	0.21	0.83
Participating in distance learning	<0.001	0.68	0.56	0.81	0.637	0.95	0.77	1.18
Concerned about entering a higher grade	<0.001	1.75	1.62	1.89	<0.001	1.74	1.59	1.91

Due to Collinearity between age and grade, age was not entered in the multivariable logistic regression analysis.
Bolded values: P < 0.05.
CI confidential Interval, OR odds ratio.

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