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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