Skip to main content

Table 2 Distribution of census tract level modeled NO 2 concentration (μg/m 3 ), socioeconomic index, and educational level

From: Relationship between area-level socioeconomic characteristics and outdoor NO2concentrations in rural and urban areas of northern Spain

   n Mean S. D. Min P25 Median P75 Max
NO 2 Urban <50% 70 12.92 5.57 3.23 8.37 11.84 17.33 25.67
Urban ≥50% 68 23.26 4.22 10.38 22.10 24.18 25.70 30.49
All 138 18.02 7.16 3.23 11.32 19.42 24.19 30.49
SE index* a Urban <50% 70 1.42 0.18 1.17 1.27 1.41 1.52 2.05
Urban ≥50% 68 1.35 0.14 1.04 1.28 1.33 1.42 1.69
All 138 1.38 0.16 1.04 1.27 1.34 1.48 2.05
Education* b Urban <50% 70 3.38 0.32 2.72 3.10 3.39 3.58 4.10
Urban ≥50% 68 3.49 0.32 2.93 3.32 3.44 3.62 4.26
All 138 3.43 0.32 2.72 3.21 3.40 3.61 4.26
  1. a SE index is based on occupation and activity (range 0–3);
  2. b Education is level of studies (range 0–4.5).
  3. * Age adjusted.
\