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Table 2 Characteristics of the locations of case households in the high and low transmission season of 2011 in Swaziland, compared against the characteristics of 10,000 population-weighted random background points

From: Rapid case-based mapping of seasonal malaria transmission risk for strategic elimination planning in Swaziland

  High season (Jan to Apr) Low season (May to Dec) Comparison of case locations between seasons
  Cases Background t-test df p Cases Background t-test df p t-test df p
N 118 10,000     44 10,000       
Mean rainfall (mm) 132.28 150.32 8.82 130 0.000 45.32 47.15 1.59 46 0.119 −37.47 168 0.000
Summed rainfall (mm) 529.11 601.28 8.82 130 0.000 362.58 377.22 1.59 46 0.119 −13.62 118 0.000
Min rainfall (mm) 46.80 63.40 14.10 134 0.000 7.04 3.45 −6.47 46 0.000 −31.11 163 0.000
Max rainfall (mm) 182.72 198.60 6.45 130 0.000 98.67 103.24 0.74 46 0.466 −12.62 61 0.000
Annual mean temperature (°C) 21.57 19.40 −24.04 137 0.000 21.42 19.40 −11.42 47 0.000 −0.73 70 0.470
Max temperature of warmest month (°C) 30.69 28.06 −21.43 134 0.000 30.42 28.06 −10.60 47 0.000 −1.07 75 0.288
Min temperature of coldest month (°C) 8.79 7.47 −16.39 133 0.000 9.13 7.47 −8.73 47 0.000 1.67 63 0.099
Elevation (m) 364.23 678.25 22.13 139 0.000 382.09 678.25 10.19 47 0.000 0.56 68 0.579
Topographic wetness index 20.34 16.61 −12.89 127 0.000 18.54 16.61 −3.62 46 0.001 −2.96 74 0.004
Landsat NDVI 0.41 0.44 4.26 128 0.000 0.42 0.44 1.92 47 0.061 0.56 81 0.580
Landsat NDWI −0.43 −0.43 0.95 136 0.346 −0.45 −0.43 2.50 47 0.016 −1.95 62 0.056
Distance to lake or irrigation 6667 16,860 16.19 140 0.000 9298 16,860 4.31 47 0.000 1.42 58 0.161
Distance to river 1424 1660 2.82 129 0.006 1380 1660 2.03 47 0.048 −0.28 81 0.781
Population per 100 m by 100 m cell 1.48 11.64 17.11 597 0.000 1.80 11.64 9.05 66 0.000 0.30 61 0.764
IRS sprayed houses per person 0.08 0.06 −2.39 125 0.018 0.16 0.05 −3.66 47 0.001 2.30 63 0.025
Nets per person 44.78 14.25 −1.30 123 0.197 10.42 0.11 −2.57 47 0.013 −1.44 130 0.152
Distance to imported case (m) 9359 11,306 2.89 128 0.005 8827 10,781 2.54 48 0.014 −0.52 120 0.602