Table 1.

Baseline characteristics of the study participants.

Variables	Wearing of face mask				All	χ2	P valuea
	No		Yes
	N	%	N	%	N
Age, years
≤ 10	69	7.25	1177	19.71	1246	134.684	< .001
11–20	562	59.03	3170	53.07	3732
21–30	48	5.04	403	6.75	451
31–40	124	13.03	750	12.56	874
≥ 41	149	15.65	473	7.92	622
Sex
Male	459	48.21	2738	45.84	3197	1.863	.172
Female	493	51.79	3235	54.16	3728
Schooling
Primary school	105	11.03	1784	29.87	1889	155.849	< .001
Middle school	344	36.13	1904	31.88	2248
High school	187	19.64	799	13.38	986
University or graduate	316	33.19	1486	24.88	1802
Daily mask wearing time, h
0–4	812	85.29	1964	32.88	2776	958.288	< .001
4–6	87	9.14	1199	20.07	1286
6–8	40	4.20	1593	26.67	1633
≥ 8	13	1.37	1217	20.38	1230