Table 4. Model with the best fit of individual- and county-level factors associated with county breast cancer incidence, 2008–2012.

Variable	Beta	Standard error	P value
Individual-level factors
5-year predicted breast cancer risk (Gail/CARE models)	0.639	0.121	<0.001
County-level factors
Lead (log)	−0.667	0.396	0.097
Population density per square mile (log) (%)	6.815	1.908	0.001