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Table 4 Output of logistic regression model with high versus low Anopheles sp. larvaedensity as outcome and ecological parameters as explanatory variable.

From: Habitat characterization and spatial distribution of Anopheles sp. mosquito larvae in Dar es Salaam (Tanzania) during an extended dry period

Variable   Odds Ratio 95% Confidence Interval for OR P-Value
Lower Upper
Type of breeding site      
  other 1    
  large drain .124 .021 .739 .022*
  small drain .768 .109 5.389 .791
  swamp .182 .053 .629 .007**
  puddle .165 .033 .832 .029*
  artificial hole .712 .198 2.556 .602
  concrete hole .348 .032 3.727 .383
General surrounding      
  high density housing 1    
  other .358 .056 2.290 .278
  industry 2.675 .326 21.950 .359
  fields .925 .275 3.112 .899
Distance to nearest inhabited house
  <10 m 1    
  10–100 m .658 .261 1.656 .374
  >100 m .409 .054 3.069 .384
Cuttcine density      
  high density 1    
  low density .728 .221 2.396 .602
  absent 1.078 .432 2.688 .872
Size of site      
  perimeter > 10 m 1    
  perimeter 1–10 m 1.565 .576 4.255 .380
  perimeter < 1 m .907 .166 4.950 .911
Turbidity of water      
  clear water 1    
  turbid water 1.653 .692 3.951 .258
  very turbid water 2.116 .372 12.030 .398
Salinity measured by conductivity [mS/cm] (Quartiles)
  2.7–20.0 1    
  1.7–2.6 1.638 .479 5.599 .431
  1.2–1.6 .818 .251 2.671 .740
  0.1–1.1 .687 .227 2.079 .507
Temperature (°C)(Quartiles)
  34.1–40.0 1    
  31.6–34.0 1.004 .315 3.203 .994
  29.4–31.5 1.312 .356 4.830 .683
  25.1–29.3 .619 .176 2.184 .456
pH of water (Quartiles)      
  8.2–10.1 1    
  7.8–8.1 .882 .228 3.419 .856
  7.5–7.7 .777 .200 3.027 .716
  6.5–7.4 .793 .198 3.182 .744
Predators present   1.322 .530 3.302 .550
Sun-lit (less than 50% of surface shaded) 1.035 .184 5.832 .969
Depth >0.5 m   .460 .174 1.219 .118
Grass present   .801 .272 2.362 .688
Floating vegetation present .352 .130 .952 .040*
Submersed vegetation present 1.745 .725 4.197 .214
  1. * = p < 0.05 ** = p < 0.01