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Table 2 Characteristics of the cohort of residents in the area of Coriano (Italy) during the period 1990-2003 by estimated air concentration of healvy metals.

From: Mortality and morbidity among people living close to incinerators: a cohort study based on dispersion modeling for exposure assessment

  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           
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)           
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           
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           
<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           
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   90980   103015   40139   354702  
  1. Totals for different variables may vary because of missing values