Table 3. Characteristics analysis of the first phase of the epidemic in Jilin Province.

Characteristic	Non-Cluster cases (n = 23)	Cluster cases (n = 74)	Test statistics	P value
Gender
Male (n = 55)	14	41	χ2 = 0.213	0.810
Female (n = 42)	9	33
Occupation
Food and beverage industry (n = 1)	0	1	-	-
Officers (n = 16)	2	14
Workers (n = 6)	3	3
Public places attendant (n = 2)	0	2
House-workers and unemployed (n = 20)	7	13
Retirees (n = 14)	3	11
workforce (n = 1)	0	1
Farmers (n = 9)	0	9
Others (n = 6)	0	6
Business services (n = 8)	3	5
Students (n = 6)	3	3
Medical staff (n = 4)	1	3
Unknown (n = 4)	1	3
Area
Urban (n = 83)	21	62	-	0.508*
Rural (n = 14)	2	12
severity
Asymptomatic cases (n = 4)	1	3	Z = -0.202	0.840
Mild Cases (n = 39)	10	29
Normal Cases (n = 48)	10	38
Severe Cases (n = 5)	2	3
Critical Cases (n = 1)	0	1
Age (n)
0–9 (1)	0	1	-	-
10–19 (3)	1	2
20–29 (22)	8	14
30–39 (15)	5	10
40–49 (24)	2	22
50–59 (16)	5	11
60–69 (8)	1	7
70–79 (5)	1	4
80- (3)	0	3
Median (Range)	33 (11,70)	44.5 (7,87)
Infection ways
Imported cases (n = 45)	19	26	-	-
Close contact with local cases (n = 8)	0	8
Close contact with provincial cases (n = 43)	4	39
Unknown (n = 1)	0	1
The detected method
Outpatient found (n = 51)	21	30	χ2 = 18.135	0.000
Active screening (n = 46)	2	44
Case classification
Confirmed cases (n = 93)	22	71	-	1.000*
Asymptomatic cases (n = 4)	1	3
Days from illness onset to diagnosis
Median (Range)	7 (2,14)	5 (0,13)	Z = 1.762	0.78
Days from diagnosis to discharged from hospital time
Median (Range)	11.5 (5,27)	17 (8,28)	Z = -1.973	0.048
Days from onset time to discharged from hospital time
Median (Range)	19.5 (13,31)	22 (11,38)	t = 0.792	0.431

* = Fisher’s exact probability test.