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Table 3 Mean census-tract NO 2 concentration (μg/m 3 ) by socioeconomic index category (based on occupation) and educational level

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

Land SE index* a NO2 Education* b NO2
n Mean S. D. n Mean S. D.
Urban <50% 1.04-1.24 11 18.71 4.31 2.72-3.03 11 17.14 6.11
1.25-1.34 16 13.29 3.55 3.04-3.24 13 13.40 4.62
1.35-1.46 10 11.69 4.81 3.25-3.49 25 10.01 3.97
1.47-1.65 24 12.43 5.65 3.50-3.82 12 13.30 6.04
1.66-2.05 5 5.39 1.94 3.83-4.26 8 15.27 6.14
Urban ≥50% 1.04-1.24 14 22.15 5.85 2.72-3.03 3 14.91 6.01
1.25-1.34 23 21.95 4.87 3.04-3.24 10 23.89 5.62
1.35-1.46 14 23.99 1.60 3.25-3.49 26 23.06 3.68
1.47-1.65 10 25.35 1.58 3.50-3.82 15 23.23 3.89
1.66-2.05 2 24.29 0.81 3.83-4.26 10 25.41 1.51
All 1.04-1.24 25 20.64 5.42 2.72-3.03 14 16.66 5.93
1.25-1.34 39 18.40 6.11 3.04-3.24 23 17.96 7.27
1.35-1.46 24 18.87 6.99 3.25-3.49 51 16.66 7.60
1.47-1.65 34 16.23 7.66 3.50-3.82 27 18.82 6.99
1.66-2.05 7 10.79 9.36 3.83-4.26 18 20.90 6.60
  1. Cut points defined on natural groupings (methods).
  2. a SE index is based on occupation and activity (range 0–3);
  3. b Education is level of studies (range 0–4.5).
  4. * Age adjusted.