TABLE 1.

Epidemiological characteristics of patients with COVID-19 in Niigata City, Japan between February and May 2020 (n = 63).

Characteristics	Mean ± SD [Median, IQR]	n	%
Age, years	47.9 ± 22.3 [45.0, 30.0–70.2]
Age categories
0–9 years		3	5
10–19 years		0	0
20–29 years		9	14
30–39 years		17	27
40–49 years		5	8
50–59 years		7	11
60–69 years		7	11
70–79 years		9	14
80–89 years		5	8
90–100 years		1	2
Sex
Male		31	49
Female		32	51
Clinical symptom
Fever (≥37.5°C at the onset symptoms)		41	65
Malaise		32	51
Cough		22	35
Sore throat		17	27
Loss of taste or smell		14	22
Runny nose		14	22
Chills		11	17
Loss of appetite		9	9
Diarrhea		2	2
Days from onset to sample collection	7.4 ± 6.5 [6.0, 6.0–9.0]
Epidemiologic linkage
Epidemiologically linked		47	75
Not epidemiologically linked		13	20
Imported		3	5

SD, standard deviation; IQR, interquartile range. Note that P1-E is not included in this table because the patient lived in a different city, and precise clinical and virological information is not available.