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Table 1 Distributions of independent variables, percentages reporting air pollution problems (APP) and mean NO2-levels.

From: A comparison of self reported air pollution problems and GIS-modeled levels of air pollution in people with and without chronic diseases

   N = 14294    Mean NO2-levels (95% CI) during four weeks after examination
Variables (% Missing)   N % %APP APP: No APP: Yes
Age 30 years 3063 21.4 25.9 29.9 (29.4 – 30.4) 36.3 (35.6 – 37.0)
  40 or 45 years 5002 35.0 21.6 25.6 (25.2 – 26.0) 33.8 (33.1 – 34.5)
  60 years 3569 25.0 20.3 25.4 (25.0 – 25.9) 33.0 (32.1 – 33.8)
  75 years 2660 18.6 16.9 26.6 (26.1 – 27.1) 32.4 (31.3 – 33.6)
Sex Men 6355 44.5 20.5 26.9 (26.5 – 27.2) 34.3 (33.6 – 34.9)
  Women 7939 55.5 22.0 26.4 (26.1 – 26.7) 33.9 (33.4 – 34.5)
Employment status (0.7%) Fulltime 8426 58.9 21.4 27.0 (26.7 – 27.3) 34.7 (34.2 – 35.3)
  Part-time 1506 10.5 22.1 25.1 (24.3 – 25.8) 33.6 (32.3 – 34.9)
  Not working 4266 29.8 20.7 26.3 (25.9 – 26.8) 32.9 (32.1 – 33.7)
Education (1.0%) Low 6987 48.9 22.0 27.4 (27.1 – 27.7) 35.0 (34.5 – 35.5)
  High 7160 50.1 20.6 25.9 (25.5 – 26.2) 33.1 (32.5 – 33.7)
Smoking (0.7%) Never 6198 43.4 20.6 26.4 (26.1 – 26.8) 34.1 (33.5 – 34.8)
  Yes, former 4407 30.8 20.7 26.2 (25.8 – 26.6) 33.5 (32.8 – 34.3)
  Yes, current 3582 25.1 22.9 27.5 (27.0 – 28.0) 34.6 (33.8 – 35.3)
Area deprivation (0.9%) 1st quintile (low) 3052 21.4 11.2 23.5 (23.1 – 23.9) 30.2 (28.9 – 31.4)
  2nd quintile 2891 20.2 26.7 32.2 (31.7 – 32.6) 35.8 (35.1 – 36.4)
  3rd quintile 2468 17.3 18.2 23.2 (22.6 – 23.7) 29.1 (27.9 – 30.3)
  4th quintile 3249 22.7 17.9 23.5 (23.0 – 24.0) 31.8 (30.7 – 32.9)
  5th quintile (high) 2499 17.5 35.3 34.5 (34.0 – 35.0) 38.0 (37.4 – 38.6)
Season of examination Winter 4016 28.1 21.1 30.6 (30.1 – 31.0) 38.3 (37.5 – 39.1)
  Spring 3005 21.0 24.1 26.0 (25.5 – 26.6) 33.6 (32.7 – 34.5)
  Summer 2286 16.0 21.7 21.4 (20.9 – 21.9) 28.6 (27.7 – 29.5)
  Autumn 4987 34.9 19.7 26.2 (25.8 – 26.5) 33.5 (32.8 – 34.1)
Pollution due to wood or oil heating/factory etc. (0.7%) No 13477 94.3 18.1 26.6 (26.4 – 26.8) 33.9 (33.4 – 34.4)
  Yes 712 5.0 72.9 27.6 (25.8 – 29.3) 34.9 (33.9 – 35.8)
Type of dwelling (0.3%) House/villa 2960 20.7 13.4 23.9 (23.4 – 24.3) 30.5 (29.3 – 31.6)
  Blocks 10541 73.7 22.7 27.1 (26.8 – 27.3) 34.3 (33.9 – 34.8)
  Other types 755 5.3 32.8 32.6 (31.5 – 33.7) 37.2 (36.0 – 38.3)
Dwelling damp, draughts or cold (0.6%) No 12750 89.2 19.3 26.5 (26.3 – 26.8) 34.0 (33.6 – 34.5)
  Yes 1464 10.2 35.3 27.7 (26.9 – 28.4) 34.2 (33.2 – 35.2)
Poor indoor climate (1.2%) No 13258 92.8 18.9 26.6 (26.3 – 26.8) 34.1 (33.6 – 34.5)
  Yes 871 6.1 49.4 27.8 (26.6 – 29.0) 34.5 (33.3 – 35.7)
Depression (2.6%) No 9122 63.8 18.4 26.4 (26.2 – 26.7) 34.2 (33.6 – 34.7)
  Some 3710 26.0 26.4 26.7 (26.2 – 27.2) 34.0 (33.3 – 34.8)
  Yes 1087 7.6 28.8 27.7 (26.8 – 25.5) 34.0 (32.7 – 35.3)
Asthma (1.8%) No 12732 89.1 20.4 26.7 (26.4 – 26.9) 34.1 (33.6 – 34.5)
  Yes 1298 9.1 28.4 25.6 (24.7 – 26.4) 33.7 (32.5 – 34.9)
COPD (2.5%) No 13260 92.8 20.6 26.5 (26.3 – 26.8) 34.1 (33.7 – 34.6)
  Yes 678 4.7 34.7 27.6 (26.5 – 28.8) 33.4 (31.9 – 34.9)
CHD (0.8%) No 12969 90.7 20.8 26.7 (26.4 – 26.9) 34.2 (33.8 – 34.6)
  Yes 1208 8.5 26.7 26.0 (25.1 – 26.8) 32.5 (31.1 – 33.9)
Diabetes (2.1%) No 13620 95.3 21.2 26.6 (26.4 – 26.9) 34.2 (33.8 – 34.6)
  Yes 376 2.6 20.2 26.7 (25.3 – 28.1) 29.6 (26.8 – 32.5)
Fibromyalgia (3.3%) No 12993 90.9 20.6 26.7 (26.5 – 27.0) 34.2 (33.7 – 34.6)
  Yes 824 5.8 28.0 24.6 (23.7 – 25.6) 32.6 (30.9 – 34.3)
Osteoporosis (2.8%) No 13331 93.3 21.0 26.7 (26.4 – 26.9) 34.1 (33.7 – 34.5)
  Yes 560 3.9 24.3 25.8 (24.6 – 26.9) 32.3 (30.2 – 34.3)
Poor self rated health (1.1%) No 10911 76.3 20.1 26.8 (26.5 – 27.0) 34.5 (34.0 – 35.0)
  Yes 3222 22.5 25.7 26.2 (25.7 – 26.7) 32.8 (32.0 – 33.6)