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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