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: | |
| 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 | |