Table 1.

Distribution of confirmed COVID-19 cases compared between importation cases and domestic transmission by sex, age, duration and residential area.

Variables	All cases N = 1030	Local resident N = 77	Imported traveler group N = 953	P	OR	95%CI
Sex
Male	522	33	489	.153	–	–
Female	508	44	464	.153	–	–
Age group
<19	50	5	45	.487	–	–
20–29	400	15	385	<.001	0.357	0.200–0.637
30–39	264	14	250	.120	–	–
40–49	120	10	110	.704	–	–
50–59	97	18	79	<.001	3.375	1.898–6.003
>60	99	15	84	.003	2.503	1.364–4.592
Duration
2020/1–2020/2	45	25	20	<.001	22.428	11.697–43.002
2020/3–2020/5	400	30	370	.981	–	–
2020/6–2020/8	52	0	52	–	–	–
2020/9–2020/11	196	0	196	–	–	–
2020/12–2021/3	337	22	315	.420	–	–
Resident area
Northern area	612	66	546	<.001	4.473	2.332–8.577
Central area	140	10	130	.872	–	–
Southern area	270	1	269	.001	0.033	0.005–0.242
Eastern area	8	0	8	–	–	–

CI = confidence interval, COVID-19 = coronavirus disease-2019, OR = odds ratio.