Table 2 Variables used for modelling hotspots of malaria infection using datasets describing the physical geography of Unguja, Zanzibar
Variable | Description | Mean (range) |
|---|---|---|
Dependent variables | ||
Apr-Jun 2011 | Binary malaria infection hotspot/non-hotspot (n = 49) for the wet season |  |
Jul-Sep 2011 | Binary malaria infection hotspot/non-hotspot (n = 49) for the dry season |  |
Independent variables | ||
Geology | Geology type: | Â |
M1: hard, dense crystalline Miocene limestone | ||
M3: dense Miocene chalky rock | ||
Q1: Quaternary tropical laterites | ||
Q2: Quaternary limestone | ||
Q2M1: mixture of Q2 and M1 | ||
Q2Q3M1: mixture of Q2, Q3 (lightly cemented Quaternary sandstone) and M1 | ||
Distance to streams | Distance to perennial streams (m) | 12251 (154–36096) |
Distance to dolines | Distance to dolines (m) | 9746 (0–26685) |
Infiltration | Soil infiltration rate: 1 = low, 2 = medium, 3 = high |  |
Landcover | Land cover type: B = bushland, C = cultivated, F = natural forest, M = mangrove, S = scrub, U = urban |  |
Elevation | Elevation (m) above sea level | 28.5 (8–99) |
Slope | Slope angle (°) | 1.5 (0.3-4.5) |
Control | ||
Condition | Condition of health facility: 1 = Very Bad, 2 = Bad, 3 = Fair, 4 = Good, 5 = New |  |