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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.
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