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Table 2 Reductions in parasite prevalence and mosquito densities after IRS.

From: Community-wide benefits of targeted indoor residual spray for malaria control in the Western Kenya Highland

Location

Survey period

Intervention

Nonintervention

Adjusted reduction (%)†

P. falciparum prevalence (%)

Valley

Before intervention

63.61 [53.63, 73.61]

39.71 [32.24, 47.18]

 

Valley

After intervention

16.44 [7.81, 25.11]

29.62 [23.16, 36.09]

65.35

Uphill

Before intervention

44.86 [34.87, 54.85]

25.04 [17.57, 32.51]

 

Uphill

After intervention

18.53 [9.88, 27.18]

19.28 [12.81, 25.74]

46.35

An. gambiae density (female/house/night)

Valley

Before intervention

3.41 [1.04, 5.76]

2.06 [0, 5.14]

 

Valley

After intervention

0.17 [0, 2.28]

3.18 [0.42, 5.93]

96.82

Uphill

Before intervention

0.94 [0, 3.31]

0.61 [0, 4.11]

 

Uphill

After intervention

0.47 [0, 2.58]

0.63 [0, 3.05]

51.6

An. funestus density (female/house/night)

Valley

Before intervention

0.78 [0.25, 1.31]

0.23 [0.06, 0.39]

 

Valley

After intervention

0.06 [0, 0.54]

0.12 [0, 0.27]

85.26

Uphill

Before intervention

0.26 [0, 0.79]

0.08 [0, 0.25]

 

Uphill

After intervention

0.05 [0, 0.53]

0.05 [0, 0.19]

69.23

  1. † Reduction in parasite prevalence and vector densities in the intervention valley and uphill area after intervention were adjusted assuming no change in the corresponding nonintervention valley or uphill area.