Table 2.

Changes in personal preventive measures and mental health status.

	Baseline	Month 3	Percentage change (%)	P -value
	n (%)	n (%)
Compliance with personal preventive measures
Consistent facemask wearing in workplace
No (never/sometimes/often)	13 (2.0)	64 (9.7)
Yes (every time)	650 (98.0)	599 (90.3)	−7.9	<0.001
Consistent facemask wearing in public
places/transportation other than workplace
No (never/sometimes/often)	19 (2.9)	37 (5.6)
Yes (every time)	644 (97.1)	626 (94.4)	−2.8	0.02
Types of facemask used
Surgical masks	288 (43.4)	232 (35.0)	−19.4	0.001
Non-surgical grade respirators	454 (68.5)	452 (68.2)	−0.4	0.95
N-95 masks	187 (28.2)	58 (8.7)	−69.1	<0.001
Cloth masks	33 (5.0)	8 (1.2)	−76.0	<0.001
Re-used facemask
No	512 (77.2)	607 (91.6)
Yes	151 (22.8)	56 (8.4)	−63.2	<0.001
Sanitizing hands (using soaps, liquid soaps or alcohol-based sanitizer) after returning from public spaces or touching public installation
Never/sometimes/often	193 (29.1)	345 (52.0)
Every time	470 (70.9)	318 (48.0)	−32.3	<0.001
Avoided social/meal gathering with other people who do not live together
No	155 (23.4)	134 (20.2)
Yes	508 (76.6)	529 (79.8)	4.2	0.18
Avoided crowded places
No	200 (30.2)	150 (22.6)
Yes	463 (69.8)	513 (77.4)	10.9	0.002
Household disinfection
Never/seldom/sometimes	347 (52.3)	412 (62.1)
Always	316 (47.7)	251 (37.9)	−20.5	<0.001
Mental health status
Score of the PHQ-9 Scale (median/IQR)	0.0 (0.0, 0.30)	0.0 (0.0, 0.0)	N.A.	<0.001
Probable depression (PHQ-9 score ≥7)
No	564 (85.1)	653 (98.5)
Yes	99 (14.9)	10 (1.5)	−90.0	<0.001
Score of the single-item Sleep Quality Scale (median/IQR)	8 (6, 9)	8 (8, 10)	N.A.	<0.001
Poor sleeping quality (sleep quality score ≤3)
No	637 (96.1)	655 (98.8)
Yes	26 (3.9)	8 (1.2)	−69.3	0.002

N.A., not applicable.