Estrogen receptor positive breast cancers and their association with environmental factors

Table 3 Variables included in the final general linear models for age-adjusted annual incidence rates of ER+ and ER- breast cancer.

Predictor	Coefficient	T	p- Value	VIF*	R² = 1 - 1/VIF
ER+ final model
Constant	255.53	8.25	<0.001	NA
Crop density	31.89	2.62	0.009	2.264	55.80%
Vapor pressure	-0.0415	-7.25	<0.001	5.753	82.60%
Precipitation	0.11647	2.78	0.006	4.132	75.80%
Radiation	-7.219	-5.21	<0.001	4.358	77.10%
HDD	-0.0094	-5.21	<0.001	5.477	81.70%
Mortality heart disease	-0.2766	-4.56	<0.001	1.466	31.80%
Unemployment rate	-2.0359	-3.57	<0.001	1.669	40.10%
EPA cancer risk	267850	3.26	0.001	1.424	29.80%
Precip X crop density	-0.2302	-2.01	0.045	NA
ER- final model
Constant	-35.86	-0.82	0.413
Crop density	3.127	1.78	0.075
Vapor pressure	-0.01268	-4.63	<0.001
Radiation	13.333	2.22	0.027
HDD	-0.00258	-2.99	0.003
Mortality heart disease	0.05211	1.72	0.086
Unemployment rate	-0.9082	-3.21	0.001
RAD^2	-0.5252	-2.61	0.009

*The variance inflation factors and the R² for each main effects variable were calculated for a model with only main effects. NA = not applicable

ISSN: 1476-072X