Table 1. Characteristics of the study participants in 2021, 2022, and 2023.

DAC-COVID: difficulties in accessing medical care when suspected of COVID-19 infection

Characteristics		2021 (n = 631)		2022 (n = 214)		2023 (n = 176)
		n	%	n	%	n	%
Age (years)	Mean±SD	26.01±4.69		26.83±4.41		32.16±10.39
Gender	Male	352	55.8	112	52.3	71	40.3
	Female	275	43.6	102	47.7	105	59.7
	Other	4	0.6	0	0	0	0
Residence status	Student	185	29.3	65	30.4	35	19.9
	Non-student workers/residents	421	66.7	143	66.8	138	78.4
	No response	25	4.0	6	2.8	3	1.7
Years in Japan (year)	Mean±SD	3.41±3.13		4.35±2.53		7.49±10.27
A history of COVID-19 Infection	Infected	57	9.0	39	18.2	82	46.6
	Not infected	574	91.0	175	81.8	94	53.4
DAC-COVID	Reported	165	26.1	29	13.6	18	10.2
	Not reported	466	73.8	185	86.5	158	89.8
Subjective health status	Poor	37	5.9	27	12.6	40	22.7
	Good	594	94.1	187	87.4	136	77.3