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