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Table 5 Description of the quantitative physical, biological and chemical parameters recorded for the open water collection sites in the ten study areas of Dakar, depending on breeding status.

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

Parameters   Anopheline larvae and pupae absent Anopheline larvae and pupae present
Perimeter (metres) n collection sites = 54 43 36
  n observations = 326 196 130
  Range 0.3 – 579.3 0.4 – 1973.6
  Mean and 95% CI 36.3 [26.0–46.7] 148.4 [76.6–220.2]
  25–50–75 percentiles 6.3 – 16.7 – 39.5 9.8 – 29.7 – 75.6
Temperature (°C) n collection sites = 54 40 34
  n observations = 248 152 96
  Range 25.0 – 39.0 25 – 40
  Mean and 95% CI 29.5 [29.1–29.9] 31.7 [30.9–32.5]
  25–50–75 percentiles 28 – 29 – 30 28 – 31 – 34
Turbidity n collection sites = 54 35 31
  n observations = 225 135 90
  Range 0 – 26 0 – 26
  Mean and 95% CI 9 [7-10] 16 [14-17]
  25–50–75 percentiles 0 – 4 – 17 8 – 19 – 23
Surface vegetation (%) n collection sites = 54 43 36
  n observations = 324 194 130
  Range 0 – 100 0 – 90
  Mean and 95% CI 32 [27-36] 18 [13-22]
  25–50–75 percentiles 2 – 10 – 60 0 – 5 – 20
Sunlight (%) n collection sites = 54 42 34
  n observations = 319 193 126
  Range 0 – 100 0 – 100
  Mean and 95% CI 63 [59–67] 69 [64–74]
  25–50–75 percentiles 50 – 70 – 95 50 – 70 – 100