Table 3.
Geographical stratification. Asthma diagnosis in the city of Malmö and the area outside.
| Malmö | Region outside Malmö | ||||||
| n | Asthma diagnosis | OR a | n | Asthma diagnosis | OR a | ||
| Heavy traffic | No | 1767 | 109(6.2%) | 1.00 | 4178 | 283(6.8%) | 1.00 |
| Yes | 1877 | 161(8.6%) | 1.35(1.05–1.75) | 1343 | 119(8.9%) | 1.28(1.02–1.61) | |
| Heaviest road within <100 m | no heavy road | 586 | 40(6.8%) | 1.00 | 3124 | 224(7.2%) | 1.00 |
| <2 cars/min | 1021 | 66(6.5%) | 0.95(0.63–1.43) | 1193 | 82(6.9%) | 0.95(0.73–1.23) | |
| 2–5 cars/min | 837 | 57(6.8%) | 0.99(0.65–1.51) | 961 | 75(7.8%) | 1.07(0.81–1.40) | |
| 6–10 cars/min | 663 | 50(7.5%) | 1.12(0.72–1.72) | 212 | 19(9.0%) | 1.21(0.74–1.99) | |
| >10 cars/min | 537 | 57(10.6%) | 1.50(0.98–2.31) | 31 | 2 | - | |
| NOx (μg/m3) | 0–8 | 13 | 1 | - | 1824 | 138(7.6%) | 1.00 |
| 8–11 | 46 | 5 | - | 1792 | 138(7.7%) | 1.01(0.79–1.30) | |
| 11–14 | 562 | 39(6.9%) | 1.00 | 1268 | 83(6.5%) | 0.81(0.61–1.08) | |
| 14–19 | 1325 | 76(5.7%) | 0.79(0.53–1.18) | 510 | 37(7.3%) | 0.93(0.64–1.36) | |
| >19 | 1698 | 149(8.8%) | 1.18(0.81–1.71) | 127 | 6(4.7%) | 0.58(0.25–1.34) | |
| p-trend | 0.044 | p-trend | 0.079 | ||||
a Adjusted for age, sex, and smoking. [OR(95%CI)].