Table 1 Socio-demographic factors of the study population

Gender

Male

71

67.6 (n = 48)

32.4 (n = 23)

0.080

1.00

Reference

Female

3

66.6 (n = 2)

33.4 (n = 1)

1.04

0.96–3.49

Age (years)

< 25

12

41.7 (n = 5)

58.3 (n = 7)

0.037

1.00

Reference

26–35

36

83.3 (n = 30)

16.7 (n = 6)

4.83

3.49–6.20

36–45

20

60.0 (n = 12)

40.0 (n = 8)

1.75

1.27–3.16

> 46

5

60.3 (n = 3)

39.7 (n = 2)

2.33

1.61–4.35

Province

Central

10

69.9 (n = 7)

30.1 (n = 3)

0.442

1.00

Reference

Eastern

5

79.4 (n = 4)

20.6 (n = 1)

1.71

1.26–4.29

North-Central

16

68.7 (n = 11)

31.3 (n = 5)

0.94

0.79–2.66

Northern

2

50.0 (n = 1)

50.0 (n = 1)

0.43

0.15–3.51

North-Western

9

77.9 (n = 7)

22.1 (n = 2)

1.50

1.15–3.57

Sabaragamuwa

5

60.3 (n = 3)

39.7 (n = 2)

0.64

0.42–0.89

Southern

6

100.0 (n = 6)

0 (n = 0)

2.14

1.49–4.68

Uva

10

69.9 (n = 7)

30.1 (n = 3)

1.00

0.87–2.91

Western

12

33.3 (n = 4)

66.7 (n = 8)

0.21

0.08–0.53

Education level

Grade 6–11

30

70.0 (n = 21)

30.0 (n = 9)

0.360

1.00

Reference

GCE O/L

31

58.0 (n = 18)

42.0 (n = 13)

0.64

0.44–1.71

GCE A/L

12

83.3 (n = 10)

16.7 (n = 2)

2.14

1.49–3.85

Graduate

1

100.0 (n = 1)

0 (n = 0)

0.43

0.21–1.18

Rank

Private

24

58.3 (n = 14)

41.7 (n = 10)

0.625

1.00

Reference

Lance Corporal/Corporal

37

75.6 (n = 28)

24.4 (n = 9)

2.22

1.54–3.33

Sergeant/staff Sergeant/Warrant Officers

9

66.4 (n = 6)

33.6 (n = 3)

1.43

1.12–3.03

2nd Lieutenant/Lieutenant/Captain

2

50.0 (n = 1)

50.0 (n = 1)

0.71

0.58–1.60

Major and above

2

50.0 (n = 1)

50.0 (n = 1)

0.71

0.58–1.60

Unit

Infantry

35

77.2 (n = 27)

22.8 (n = 8)

0.235

1.00

Reference

Support

23

52.1 (n = 12)

47.9 (n = 11)

0.32

0.21–1.26

Service

14

71.4 (n = 10)

28.6 (n = 4)

0.74

0.49–1.54

Sri Lanka Army Women’s Corps

2

50.0 (n = 1)

50.0 (n = 1)

0.30

0.23–1.08

History of working/travel in to the jungles

Yes

25

68.0 (n = 17)

32.0 (n = 8)

0.950

1.00

Reference

No

49

67.4 (n = 33)

32.6 (n = 16)

1.03

1.00–2.06

History of overseas travel

Yes

4

75.0 (n = 3)

25.0 (n = 1)

0.540

1.00

Reference

No

70

67.1 (n = 47)

32.9 (n = 23)

0.91

0.75–2.59

Continent of travel

Asia

2

50.0 (n = 1)

50.0 (n = 1)

0.710

1.00

Reference

Out of Asia

2

50.0 (n = 1)

50.0 (n = 1)

1.00

0.91–3.92

Not travelled

70

67.1 (n = 47)

32.9 (n = 23)

2.04

1.44–4.86

Use of insect repellant

Yes

10

40.0 (n = 4)

60.0 (n = 6)

0.045

1.00

Reference

No

64

71.9 (n = 46)

28.1 (n = 18)

3.83

2.69–5.21

Use of mosquito nets

Yes

65

69.2 (n = 45)

30.8 (n = 20)

0.411

1.00

Reference

No

9

55.7 (n = 5)

44.3 (n = 4)

1.80

0.99–3.22

Type of sleeves in the upper part of the uniform

Short sleeves

62

72.6 (n = 45)

27.4 (n = 17)

0.036

1.00

Reference

Long sleeves

12

41.7 (n = 5)

58.3 (n = 7)

3.71

2.59–4.98

Length of trousers of uniform

Short trouser

14

85.7 (n = 12)

14.3 (n = 2)

0.107

1.00

Reference

Long trousers

60

63.4 (n = 38)

36.6 (n = 22)

3.47

2.41–5.06

Footwear

Boots

25

63.9 (n = 16)

36.1 (n = 9)

0.27

1.00

Reference

Slippers

27

85.2 (n = 23)

14.8 (n = 4)

3.23

2.24–4.57

Does not wear foot wear regularly

4

74.5 (n = 3)

25.5 (n = 1)

1.69

1.04–4.09

Shoes

28

64.3 (n = 18)

35.7 (n = 10)

1.01

0.97–2.14