Table 1 Sociodemographic variables studied by logistic regression analysis

Age

 ≤ 15 years

95/21

< 0.0001

1.72

14/103

0.9

− 0.09

19/97

0.02

1.60

78/38

0.0003

1.36

13/103

0.4

0.52

 > 15 years

29/37

7/59

3/63

23/43

4/62

Gender

 Male

54/33

0.07

0.66

9/78

0.7

0.23

12/75

0.5

− 0.36

45/42

0.2

0.39

10/77

0.3

− 0.62

 Female

70/25

12/83

10/85

39/56

7/88

Symptoms

 Asymptomatic

98/46

0.2

− 0.58

17/127

0.3

− 0.70

16/128

0.9

0.07

84/60

0.04

− 0.88

16/128

0.08

− 2.00

 Symptomatic

26/12

4/34

6/32

17/21

1/37

Flooring

 Dirt

56/26

1

− 0.02

15/67

0.005

− 1.61

15/67

0.03

− 1.14

39/43

0.08

0.61

11/71

0.02

− 1.48

 Cement

68/32

6/94

7/93

62/38

6/94

Water

 City

101/44

0.6

− 0.26

16/129

0.7

− 0.24

17/128

0.7

− 0.18

85/60

0.4

− 0.39

15/130

0.1

− 1.45

 Other

23/14

5/32

5/32

16/21

2/35

Sewer system

 In-house

26/12

0.9

0.05

2/36

0.1

1.73

4/34

0.6

0.42

22/16

0.9

− 0.04

2/36

0.1

1.42

 Other

98/46

19/125

18/126

79/65

15/129

Domestic animals

 Presence

75/30

0.4

0.68

14/91

0.2

2.19

16/89

0.2

2.39

56/49

0.9

− 0.14

9/96

0.2

2.08

 Absence

49/28

7/70

6/71

45/32

8/69

Farm animals

 Presence

39/12

0.2

0.57

10/41

0.03

1.51

8/43

1

− 0.03

28/23

0.8

0.13

6/45

0.3

0.77

 Absence

85/46

11/120

14/117

73/58

11/120

Poultry

 Presence

10/3

0.7

0.27

2/11

0.6

0.57

3/10

0.4

0.89

6/7

0.6

− 0.38

1/12

0.9

0.25

 Absence

114/55

19/150

19/169

95/74

16/153

House pests

 Presence

80/33

0.5

− 0.53

14/99

0.1

− 2.55

16/97

0.2

− 2.02

61/52

1

0

9/104

0.1

− 2.60

 Absence

44/25

7/62

6/63

40/29

8/61