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Table 6 Description of the risk classes in 1996 and 2007.

From: Spatial heterogeneity and temporal evolution of malaria transmission risk in Dakar, Senegal, according to remotely sensed environmental data

Class Risk Built-up area in 300-m radius buffer An. arabiensis aggressiveness evaluated from the model
(number of bites/person/night)
Area of the risk class in 1996 (Ha) Area of the risk class in 2007 (Ha) Difference in risk class areas between 1996 and 2007 % difference in risk class areas between 1996 and 2007 % of the risk class area in 1996 % of the risk class area in 2007
1 High < 20 ha [2.82 - 0.28[ 1457 1195 -262 -18% 32% 20%
2 Medium [20-26[ ha [0.28 - 0.03[ 1735 2267 +532 +31% 39% 39%
3 Low > = 26 ha < = 0.03 1319 2385 +1066 +81% 29% 41%
Total     4511 5847 +1336 +30% 100% 100%
  1. All values are extracted from Figure 1.