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Table 2 Final general linear model showing significant predictors of autism and interaction terms (the analysis include the outlier county from Oregon)

From: An ecological study on childhood autism

Term Coefficient T statistic p-value
Constant 0.546 46.12 <0.001
State of Washington (Reference State)   
California −0.155 −7.53 <0.001
Oregon 0.215 10.63 <0.001
% Surface drinking water 0.005 0.45 0.654
Annual Suicide rate 0.035 2.71 0.008
Average annual unemployment rate (1990,1995, and 2000) −0.026 −2.37 0.020
Annual Precipitation 0.035 2.71 0.008
EPA Neurological Disease Risk 0.026 2.28 0.025
Heating Degree Days (HDD) −0.067 −4.35 <0.001
EPA Neurological Disease Risk X HDD (interaction) −0.040 −2.19 0.031
Precipitation X % Surface drinking water (interaction) 0.025 2.13 0.035
  1. The adjusted R2 for the model was 0.724. We used standardized explanatory variables in our model to enable comparison of coefficients.