Table 3 Geographical stratification. Asthma diagnosis in the city of Malmö and the area outside.

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

-

NO_x (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