Male

Female

Total

p-value

n

%

n

%

n

%

Age

18-22

107

90.68

274

96.48

381

94.78

0.017*

>22

11

9.32

10

3.52

21

5.22

Ethnicity

Kinh

114

96.61

273

96.13

387

96.27

0.816

Others

4

3.39

11

3.87

15

3.73

Marital status

Married

0

0

1

0.35

1

0.25

0.596

Single

115

97.46

279

98.24

394

98.01

Others

3

2.54

4

1.41

7

1.74

How many times have been infected with COVID-19?

Once

103

87.29

255

89.79

358

89.05

0.571

Twice

11

9.32

24

8.45

35

8.71

>2 time

4

3.39

5

1.76

9

2.24

How long ago did you infect with COVID-19 for the first time?

<1 month

8

6.78

12

4.23

20

4.98

0.016*

1-3 months

5

4.24

25

8.8

30

7.46

3-6 months

33

27.97

70

24.65

103

25.62

6 months – 1 year

51

43.22

153

53.87

204

50.75

> 1 year

21

17.8

24

8.45

45

11.19

Where do you get treatment?

Hospital

2

1.69

2

0.7

4

1

0.220

At home

115

97.46

272

95.77

387

96.27

Isolation zone

1

0.85

10

3.52

11

2.74

Others

0

0

0

0

0

0

Chronic disease before being injected with COVID- 19

No

117

99.15

274

96.48

391

97.26

0.135

Yes

1

0.85

10

3.52

11

2.74

Received the COVID-19 vaccine before being injected with COVID- 19

Not injected

7

5.93

15

5.28

22

5.47

0.362

Received the first dose

19

16.1

68

23.94

87

21.64

Received two doses

54

45.76

123

43.31

177

44.03

Received two and extra doses

38

32.2

78

27.46

116

28.86

Self-rate health

Very good

42

35.59

47

16.55

89

22.14

<0.001*

Good

56

47.46

108

38.03

164

40.8

Fair

20

16.95

118

41.55

138

34.33

Poor

0

0

11

3.87

11

2.74

Very poor

0

0

0

0

0

0