Table 2.
Descriptive statistics of predictor variables for YF vulnerability models, 2000–2017. Mean and standard deviation values are shown for continuous predictors, and counts of positive values with percentages are shown for binary variables.
| predictor | mean (N) | s.d. (%) | min | 25% | 50% | 75% | max |
|---|---|---|---|---|---|---|---|
| 2000–2016 | |||||||
| % rain days | 47.1 | 12.9 | 10.4 | 39.7 | 45.8 | 51.8 | 100 |
| temperature | 23.1 | 2.5 | 16.8 | 21.1 | 22.9 | 25.1 | 29.5 |
| population density (1000) | 0.195 | 0.826 | 0.000 | 0.012 | 0.029 | 0.076 | 13.267 |
| elevation | 508.289 | 285.961 | 6.438 | 289.931 | 508.013 | 734.937 | 1414.086 |
| vegetation | 0.5925 | 0.128 | −0.300 | 0.524 | 0.602 | 0.675 | 0.902 |
| drainage | 0.091 | 0.016 | 0.055 | 0.082 | 0.089 | 0.095 | 0.343 |
| biome—tropical and subtropical grasslands, savannahs and shrublands | 3910 | 24.7 | 0 | 0 | 0 | 0 | 1 |
| biome—other | 2550 | 16.1 | 0 | 0 | 0 | 0 | 1 |
| cases within 50 km | 835 | 5.3 | 0 | 0 | 0 | 0 | 1 |
| cases bordering | 364 | 2.3 | 0 | 0 | 0 | 0 | 1 |
| 2017 | |||||||
| % rain days | 44.0 | 12.6 | 17.8 | 36.3 | 43.3 | 47.9 | 98.6 |
| temperature | 23.3 | 2.6 | 18.4 | 21.1 | 22.9 | 25.3 | 28.7 |
| population density (1000) | 0.217 | 0.898 | 0.000 | 0.013 | 0.031 | 0.083 | 13.353 |
| elevation | 508.271 | 286.106 | 6.438 | 289.761 | 506.306 | 733.973 | 1414.086 |
| vegetation | 0.592 | 0.138 | −0.300 | 0.523 | 0.604 | 0.684 | 0.890 |
| drainage | 0.091 | 0.016 | 0.055 | 0.082 | 0.089 | 0.095 | 0.343 |
| biome—tropical and subtropical grasslands, savannahs and shrublands | 230 | 24.7 | 0 | 0 | 0 | 0 | 1 |
| biome—other | 150 | 16.1 | 0 | 0 | 0 | 0 | 1 |
| cases within 50 km | 449 | 48.2 | 0 | 0 | 0 | 1 | 1 |
| cases bordering | 261 | 28.0 | 0 | 0 | 0 | 1 | 1 |