Table 2 Univariate analysis of the effects of environmental factors on CL in South Khorasan Province
Variable | P-value | OR | 95% CI |
|---|---|---|---|
Soil class | |||
 Dune land (constant) | 0.000 |  |  |
 Entisols/Aridisols | 0.462 | 2.153 | 0.279–16.6290 |
 Aridisols | 0.252 | 3.207 | 0.437–23.555 |
 Salt flats | 0.532 | 2.160 | 0.193–24.190 |
 Rocky land | 0.677 | 1.539 | 0.203–11.676 |
 Rock outcrops/entisols | 0.941 | 0.926 | 0.12–7.141 |
 Playa | 1 | 0.000 |  |
Land cover | |||
 Garden (constant) | 0.000 |  |  |
 Agriculture | 0.005 | 2.769 | 1.358–5.646 |
 Rangeland | 0.773 | 0.894 | 0.420–1.906 |
 Rock | 0.74 | 1.42 | 0.179–11.256 |
 Urban | 0.000 | 49 | 20.888–114.947 |
 Bare land | 0.912 | 1.068 | 0.333–3.427 |
DEM | 0.022 | 0.999 | 0.999–1 |