| Heavy metals air concentration |  |  | |||||||
---|---|---|---|---|---|---|---|---|---|---|
 | I | II | III | IV |  |  | ||||
 | <0.5 ng/m3 | 0.5 -1 ng/m3 | 1-2 ng/m3 | >2 ng/m3 | Total | |||||
 | n | % | n | % | n | % | n | % | n | % |
Total | 10391 | 33.1 | 7961 | 25.4 | 9400 | 30.0 | 3595 | 11.5 | 31347 | 100.0 |
gender | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
male | 4966 | 47.8 | 3775 | 47.4 | 4602 | 49.0 | 1811 | 50.4 | 15154 | 48.3 |
female | 5425 | 52.2 | 4186 | 52.6 | 4798 | 51.0 | 1784 | 49.6 | 16193 | 51.7 |
age (years) | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
0 -44 | 5051 | 48.6 | 4178 | 52.5 | 4414 | 47.0 | 1720 | 47.8 | 15363 | 49.0 |
45 -59 | 2457 | 23.6 | 1808 | 22.7 | 2347 | 25.0 | 894 | 24.9 | 7506 | 23.9 |
60-74 | 1780 | 17.1 | 1266 | 15.9 | 1548 | 16.5 | 614 | 17.1 | 5208 | 16.6 |
75+ | 1103 | 10.6 | 709 | 8.9 | 1091 | 11.6 | 367 | 10.2 | 3270 | 10.4 |
Socioeconomic status | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
low | 871 | 8.6 | 405 | 5.3 | 1294 | 14.7 | 656 | 20.6 | 3226 | 10.8 |
medium low | 2289 | 22.5 | 659 | 8.6 | 3844 | 43.7 | 1088 | 34.1 | 7880 | 26.4 |
medium | 2893 | 28.4 | 1633 | 21.3 | 2650 | 30.1 | 942 | 29.6 | 8118 | 27.2 |
medium high | 3311 | 32.6 | 2515 | 32.8 | 932 | 10.6 | 500 | 15.7 | 7258 | 24.3 |
high | 805 | 7.9 | 2447 | 31.9 | 74 | 0.8 | 0 | 0.0 | 3326 | 11.2 |
missing | 222 | 2.1 | 302 | 3.8 | 606 | 6.4 | 409 | 11.4 | 1539 | 4.9 |
NO 2 concentration | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
<30 μg/m 3 | 2624 | 25.3 | 1404 | 17.6 | 2851 | 30.3 | 956 | 26.6 | 7835 | 25.0 |
31-35 μg/m 3 | 2369 | 22.8 | 4188 | 52.6 | 3554 | 37.8 | 1478 | 41.1 | 11589 | 37.0 |
36-40 μg/m 3 | 2012 | 19.4 | 2012 | 25.3 | 1896 | 20.2 | 932 | 25.9 | 6852 | 21.9 |
>40 μg/m 3 | 3386 | 32.6 | 357 | 4.5 | 1099 | 11.7 | 215 | 6.0 | 5057 | 16.1 |
Change of exposure during follow-up | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
never | 9744 | 93.8 | 7175 | 90.1 | 8737 | 92.9 | 3252 | 90.5 | 29185 | 93.1 |
one o more changes | 647 | 6.2 | 786 | 9.9 | 663 | 7.1 | 343 | 9.5 | 2462 | 7.9 |
Person years | 120568 | Â | 90980 | Â | 103015 | Â | 40139 | Â | 354702 | Â |