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Table 2 Sociodemographic factors of seropositive participants for chikungunya, flavivírus and probable dengue from seroepidemiological research in the city of Juazeiro do Norte, Brazil, 2018

From: Seroprevalence, spatial dispersion and factors associated with flavivirus and chikungunya infection in a risk area: a population-based seroprevalence study in Brazil

Variables (N°)

N

Positive Chikungunya patients

Positive Flavivirus patients

Probable Dengue Cases

N +

Crude PR

(95% CI)

PR (95% CI) Adjusted by age group

N +

Crude RP

(95% IC)

PR (95% CI) Adjusted by age group

N +

Crude RP

(95% IC)

PR (95% CI) Adjusted by age group

Gender (404)

 Male

128

68

1.12 (0.75–1.58)

120

0.97 (0.92–1.03)

46

1.07 (0.81–1.41)

 Female

276

35

1.00

253

1.00

107

1.00

Age group in years (404)

 4–19

44

09

1.00

33

1.00

21

1.00

 20–45

177

41

1.13 (0.59–2.15)

161

1.21 (1.01–1.44) **

68

1.24 (0.86–1.78)

 46–60

69

15

1.06 (0.63–2.21)

68

1.14 (0.94–1.39)

27

1.21 (0.79–1.86)

  > 60

114

38

1.62 (0.86–3.08)

111

1.29 (1.09–1.54) **

37

1.47 (0.97–2.20)

Educational level (404)

 Illiterate

234

65

1.85 (0.63–5.36)

217

1.03 (0.88–1.19)

73

1.92 (1.28–2.88)**

 Elementary School

38

10

1.75 (0.54–5.65)

36

1.05 (0.89–1.24)

13

1.75 (0.99–3.09)

 High School

112

25

1.48 (0.49–4.46)

102

1.01 (0.86–1.18)

55

1.22 (0.81–1.83)

 University graduate

20

3

1.00

18

1.00

12

1.00

Occupation/work (404)

 Retired

97

31

1.17 (0.54–2.55)

93

1.19 (1.01–1.41)

26

1.07 (0.69–1.65)

 Informal work

83

19

1.64 (0.79–3.39)

54

1.19 (1.01–1.41)

23

2.20 (1.29–3.42)**

 Unemployed

67

18

1.38 (0.63–2.99)

79

1.18 (0.99–1.39)

30

1.38 (0.89–2.13)

 Housewife

65

15

1.18 (0.53–2.63)

61

1.16 (0.98–1.38)

26

1.25 (0.80–1.94)

 Permanent job

56

13

1.19 (0.52–2.70)

57

1.05 (0.87–1.27)

30

1.11 (0.73–1.70)

 Student

36

07

1.00

29

1.00

18

1.00

Family income (404) £

  < 954

188

50

1.59 (0.26–9.70)

175

1.11 (0.77–1.60)

68

1.08 (0.34–3.41)

 Mid 954 and 1999

119

31

1.56 (0.25–9.46)

108

1.08 (0.75–1.56)

42

1.05 (0.33–3.36)

 Mid 2000 and 4599

85

19

1.34 (0.21–8.38)

80

1.12 (0.78–1.62)

38

1.34 (0.42–4.26)

  ≥ 5000

06

01

1.00

05

1.00

02

1.00

Self-reported arbovirus

 CHIKV

92

64

5.05 (3.70–6.89)**

4.99 (3.64–6.84)**

88

1.03 (0.94–1.14)

27

1.21 (0.75–1.95)

 DENV

112

29

1.01 (0.70–1.46)

2.37 (1.32–4.25)**

108

1.06 (1.00–1.11)

1.05 (1.01–1.11)*

47

1.15 (0.88–1.50)

 ZIKV

22

10

1.85 (1.13–3.03)*

21

1.04 (0.99–1.10)

10

0.79 (0.56–1.10)

Underlying diseases

 Hypertension

104

32

1.33 (0.92–1.93)

102

1.09 (1.04–1.15)**

1.00 (0.98–1.03)

28

1.70 (1.20–2.40)**

1.05 (1.02–1.07)**

 Diabetes

50

15

1.26 (0.78–2.03)

50

1.11 (1.06–1.15)**

1.01 (0.99–1.03)

17

1.27 (0.84–1.92)

0.83 (0.55–1.27)

 High Cholesterol

47

15

1.28 (0.81–2.00)

47

1.09 (1.06–1.13)*

1.04 (1.01–1.07)**

14

0.76 (0.48–1.20)

0.82 (0.51–1.32)

 Anxiety

20

7

1.39 (0.74–2.59)

20

1.08 (1.05–1.12)*

1.06 (1.02–1.09)**

08

1.05 (0.61–1.83)

1.10 (0.62–1.95)

 Asthma

8

5

2.51 (1.43–4.41)**

2.33 (1.31–4.11)**

7

1.08 (1.05–1.10)

7

1.08 (1.05–1.10)

 Artrhitis

18

9

2.04 (1.24–3.34)**

1.78 (1.05–3.00)**

8

1.08 (1.04–1.11)

8

1.08 (1.04–1.11)

Care of standing water and garbage (404)

242

55

0.76 (0.54–1.06)

224

1.00 (0.94–1.06)

103

1.37 (1.04–1.81)**

0.90 (0.85–0.95)**

  1. Subtitle: N total number. N+ number of positive pacients. PR Prevalence ratio. *0.01 < p < 0.05 and **p < 0.01