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Table 6 Factors related to the presence/absence of anopheline larvae.

From: Highly focused anopheline breeding sites and malaria transmission in Dakar

Habitat characteristics

Number of obs.

Number of obs.

positive for anopheline larvae

% obs.

anopheles positive

OR

95% CI

p-value

Zone

     

< 0.001

Yarakh

92

3

3%

1

  

Parcelles Grand Medine *

7

1

14%

2.51

0.06 – 97.52

0.623

Gibraltar

4

1

25%

7.71

0.34 – 173.14

0.198

Pikine

91

29

32%

11.83

2.31 – 60.62

0.003

Ouest Foire

36

23

64%

41.99

6.96 – 253.38

<0.001

Université

21

15

71%

65.20

8.70 – 488.74

<0.001

Hann Maristes

23

18

78%

68.69

9.11 – 517.73

<0.001

Almadies

49

38

78%

95.02

15.33 – 589.07

<0.001

Liberté 5

0

0

0%

-

  

Yoff Village

0

0

0%

-

  

Habitat type

     

<0.001

"Céanes", cemented weels or basins

128

5

4%

1

  

Man-made water collections

18

5

28%

2.45

0.29 – 20.83

0.412

Canals

8

4

50%

3.02

0.21 – 43.62

0.417

Waterproof containers

15

6

40%

4.43

0.48 – 40.62

0.188

Swamp areas, marshes, ponds or lakes

44

24

55%

7.82

1.40 – 43.73

0.019

Ditches or puddles

110

84

76%

24.82

4.63 – 130.82

<0.001

Period

     

0.793

Weeks 1 – 4

162

62

38%

1

  

Weeks 5 – 8

161

66

41%

1.09

0.58 – 2.03

 

Temporary collection

     

0.058

No

155

22

14%

1

  

Yes

168

106

63%

2.67

0.97 – 7.37

 

Perimeter (metres)

     

0.168

<20 m

157

54

34%

1

  

>= 20 m

166

74

45%

0.59

0.27 – 1.25

 

Water temperature (n = 243)

     

0.077

<30°C

120

31

26%

1

  

>= 30°C

123

62

50%

1.96

0.93 – 4.13

 

Turbidity (n = 222)

     

0.808

<13 (clear)

106

26

25%

1

  

>= 13 (turbid)

116

62

53%

1.09

0.54 – 2.21

 

Surface vegetation (%, n = 320)

     

0.078

<20%

195

93

48%

1

  

>= 20%

125

35

28%

0.44

0.18 – 1.10

 

Sunlight (%, n = 317)

     

0.974

<80%

202

73

36%

1

  

>= 80%

115

52

45%

0.99

0.40 – 2.45

 

Presence of predator (n = 287)

     

0.641

No

132

55

42%

1

  

Yes

155

54

35%

0.84

0.41 – 1.74

 

Presence of Culicinae larvae (n = 293)

     

<0.001

No

211

48

23%

1

  

Yes

84

58

69%

5.46

2.55 – 11.66

 
  1. Adjusted (by study area) odds ratio (OR) estimated by GEE logistic regression model. Bivariate analysis: 323 observations of water collection sites unless otherwise indicated.
  2. * Water collections found outside of the 200 × 200 m study area