Table 1.

Correlation values between human WNV disease incidence and the proportion of each land cover at a county resolution at the national extent

Land cover type	Pearson	P value	Spearman	P value
Developed, open space	−0.21	< 2.20 × 10−16	−0.11	1.43 × 10−9
Developed, low intensity	−0.25	< 2.20 × 10−16	−0.11	5.39 × 10−10
Developed, medium intensity	−0.18	< 2.20 × 10−16	−0.09	1.96 × 10−7
Developed, high intensity	−0.12	1.40 × 10−11	−0.04	0.034
Barren land	−0.05	0.008	−0.06	5.50 × 10−4
Deciduous forest	−0.51	< 2.20 × 10−16	−0.46	< 2.20 × 10−16
Evergreen forest	−0.29	< 2.20 × 10−16	−0.32	< 2.20 × 10−16
Mixed forest	−0.32	< 2.20 × 10−16	−0.36	< 2.20 × 10−16
Shrub	0.03	0.06	−0.04	0.012
Grassland	0.46	< 2.20 × 10−16	0.27	< 2.20 × 10−16
Pasture	−0.28	< 2.20 × 10−16	−0.22	< 2.20 × 10−16
Crops	0.3	< 2.20 × 10−16	0.35	< 2.20 × 10−16
Woody wetland	−0.19	< 2.20 × 10−16	−0.11	8.69 × 10−10
Herbaceous wetland	0.1	5.01 × 10−9	0.14	1.01 × 10−14

Land cover types in bold font are statistically significant.