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Table 1 Spatial covariates selected for GAM (after removing colilinearity)

From: A spatial model to predict the incidence of neural tube defects

Spatial Covariates selected

Buffer distance (m)

R

V.P

F

p-value

Geographic location

-

-

19.03

3.828

7.53e-7*

Fertilizer used

-

0.40

25.64

14.74

<2e-16*

Shortest distance to faults

-

−0.14

4.96

2.499

0.01*

Shortest distance to rivers

-

−0.22

7.52

4.149

5.12e-5*

Lithodological type of Trias Liujiagou Group (T*)

1500

−0.23

1.04

0.03

0.0328*

Calcareous lithodological soil

2500

0.21

-

19.14

1.64e-5*

Brick clay lithodological type(Q*)

1500

0.30

-

16.19

3.78e-9*

  1. V.P: the percent of variance explained by the factor variable (%) in GAM; R: Pearson correlation; F: statistics of ANOVA test; p-value: statistical significance.