Table 1.

Correlation coefficients for regression analyses between different types of cancers.

Cancer types		Correlation (r)	Number of counties	Race/Ethnicity	P Value
Breast	Prostate	0.332	2651a	Caucasians & Hispanics	< 0.001
Breast	Prostate	0.336	2205 b	All races	< 0.001
Breast	Colon/Rectum	0.139	1804 b	All races	< 0.001
Breast	Lung/Bronchus	0.149	1845 b	All races	< 0.001
Breast	Ovary	0.106	801 b	All races	0.003
Prostate	Lung/Bronchus	-0.018	2070 b	All races	0.41
Prostate	Colon/Rectum	0.124	1859 b	All races	< 0.001

Ordinary least square regressions analyses were conducted on age-adjusted (to the 2000 U.S. standard population) county level average incidence rates (cases per 100,000 population per year) for different types of cancers. Data used in these analyses were extracted from the National Cancer Institute (NCI) and State Cancer Registries.

^aData from counties in all states were included for the period between 2000 (or 2001) and 2004 (or 2005).

^b Data from counties in all states except Illinois, Maryland, Minnesota, Mississippi, North Dakota, Tennessee and Virginia were included for the period between 2000 (or 2001) and 2004.