Table 3.

Correlation Between BMI and Mean Commute Times and Food Retail Gap per Capita in 100 North Carolina Counties

Variable	Retail Gap per Capitaa
	NAICS Code 445b	NAICS Code 722c	NAICS Codes 445 + 722	County-Level BMI
Commute time 1990	0.26	0.41	0.34	0.12
Commute time 2000	0.35	0.51	0.44	0.31
Commute time difference (2000 − 1990)	0.29	0.35	0.34	0.46
County-level BMI	0.37	0.24	0.34	1.00

Abbreviations: BMI, body mass index; NAICS, North American Industry Classification System.

^a Retail gap per capita calculated by subtracting county-level sales of products for a NAICS category in 2008 from county-level demand for products in that category in 2008. P values ranged from <.001 to .01 using a t test except that for commute time in 1990 and BMI (P = .22).

^b NAICS code 445 defined as stores that sell food and beverages from fixed point-of-sale locations, including supermarkets, grocery stores, convenience stores, meat markets, produce markets, and specialty food stores.

^c NAICS code 722 defined as food services and drinking places that prepare meals, snacks, and beverages to customer order for consumption on and off the premises, including full-service restaurants, limited-service eating places (fast-food restaurants), special food services, and drinking places.