Skip to main content

Advertisement

Table 7 Factors related to anopheline larval density.

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

Habitat characteristics Number of obs. Number of dips Total number of anopheline larvae Anopheline larval density (per dip) RR 95%CI p-value
Zone        0.028
Hann Maristes 18 209 208 1.00 ref.   
Pikine 27 140 357 2.55 1.66 0.77 – 3.60 0.198
Université 14 54 246 4.56 2.23 0.91 – 5.46 0.080
Yarakh 2 18 110 6.11 2.28 0.41 – 12.76 0.348
Ouest Foire 22 93 578 6.22 3.09 1.38 – 6.95 0.006
Almadies 38 179 1309 7.31 4.09 1.98 – 8.45 <0.001
Gibraltar 2 9 160 17.78 8.10 1.48 – 44.39 0.016
Parcelles Grand Medine * 0 - - -    
Liberté 5 0 - - -    
Yoff Village 0 - - -    
Habitat type        <0.001
"Céanes", cemented weels or basins 8 53 126 2.38 ref.   
Waterproof containers 5 17 30 1.76 2.56 0.45 – 14.72 0.291
Swamp areas, marshes, ponds or lakes 22 116 467 4.03 14.76 3.76 – 57.88 <0.001
Ditches or puddles 80 488 2137 4.38 15.96 4.44 – 57.36 <0.001
Man-made water collections 4 16 82 5.13 17.45 2.62 – 116.14 0.003
Canals 4 12 126 10.50 22.50 3.90 – 129.71 <0.001
Period        0.762
Weeks 1 – 4 57 328 1775 5.41 ref.   
Weeks 5 – 8 66 374 1193 3.19 0.94 0.63 – 1.40  
Temporary collection        0.292
No 23 134 379 2.83 ref.   
Yes 100 568 2589 4.56 1.44 0.73 – 2.85  
Perimeter (metres)        0.755
<20 m 49 226 1078 4.77 ref.   
>= 20 m 74 476 1890 3.97 0.93 0.59 – 1.46  
Water temperature (n = 93)        <0.001
<30°C 33 228 475 2.08 ref.   
>= 30°C 60 307 1611 5.25 3.34 1.97 – 5.68  
Turbidity (n = 88)        0.592
<13 (clear) 28 142 700 4.93 ref.   
>= 13 (turbid) 60 392 1261 3.22 0.87 0.52 – 1.46  
Surface vegetation (%)        0.001
<20% 89 504 2596 5.15 ref.   
>= 20% 34 198 372 1.88 0.41 0.24 – 0.70  
Sunlight (%, n = 120)        0.674
<80% 72 447 1194 2.67 ref.   
>= 80% 48 244 1665 6.82 1.13 0.64 – 2.00  
Presence of predator(n = 104)        0.865
No 48 308 1326 4.31 ref.   
Yes 56 286 1245 4.35 0.96 0.59 – 1.56  
Presence of Culicinae larvae (n = 106)        0.016
No 51 291 1259 4.33 ref.   
Yes 55 321 1033 3.22 1.71 1.10 – 2.64  
  1. Adjusted (by study area) risk ratio (RR) estimated by GEE negative binomial regression model. Bivariate analysis; 123 observations of anopheline breeding sites, unless otherwise indicated.
  2. * Water collections found outside of the 200 × 200 m study area