Table 3.

Validity of secondary data source as compared to ground-truth effort among 14 counties in rural Appalachia Kentucky 2011

Data Source and Type of Food Outlet	Sensitivity	95% CI	PPV	95% CI
InfoUSA 2011
All Food Outlets	0.96	0.89, 1.03	0.7	0.67,0.73
Grocery Store	1.00	1.00, 1.00	0.38	0.32, 0.45
Super Market	0.96	0.85, 1.07	0.87	0.83, 0.95
Super Center	1.00	1.00, 1.00	1	1.00, 1.00
Convenience Store	1.00	1.00, 1.00	0.56	0.48, 0.60
Gas station with food mart	0.99	0.85, 1.08	0.74	0.69, 0.87
Fast-food and Fast-casual restaurants	1.00	1.00 , 1.00	0.95	0.89, 1.02
Pizza Parlors	0.96	0.82, 1.09	0.81	0.75, 0.89
Dollar Stores	0.20	0.14, 0.24	1	1.00, 1.00
Farmer's Markets	0.50	0.41, 0.62	1	1.00, 1.00

Abbreviations: CI, confidence interval; PPV, positive predictive value.