Table 3 County characteristics by urban and non-urban classification
From: Temperature, ozone, and mortality in urban and non-urban counties in the northeastern United States
Urban counties (n = 23) | Non-Urban counties (n = 68) | |
|---|---|---|
Mean ± SD | Mean ± SD | |
% Families in poverty | 8.9 ± 6.3 | 7.2 ± 2.6 |
Population density, person/mile2 | 9,390.4 ± 15,756.8 | 231.3 ± 224.8 |
% Over 65 | 12.7 ± 1.3 | 14.0 ± 2.6 |
Ozone, ppb | 45.6 ± 2.5 | 45.7 ± 2.8 |
Temperature, °F | 75.8 ± 1.4 | 73.1 ± 2.0 |