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Table 4 Geographical stratification. Asthma symptoms in the city of Malmö and the region outside.

From: Traffic-related air pollution associated with prevalence of asthma and COPD/chronic bronchitis. A cross-sectional study in Southern Sweden

  

Malmö

Region outside Malmö

  

n

Asthma symptoms

OR a

n

Asthma symptoms

OR a

Heavy traffic

No

1767

209(11.8%)

1.00

4178

449(10.7%)

1.00

 

Yes

1877

263(14.0%)

1.17(0.96–1.43)

1343

178(13.3%)

1.23(1.02–1.49)

Heaviest road within <100 m

No heavy road

586

74(12.6%)

1.00

3124

342(10.9%)

1.00

 

<2 cars/min

1021

119(11.7%)

0.93(0.68–1.26)

1193

142(11.9%)

1.09(0.88–1.34)

 

2–5 cars/min

837

101(12.1%)

0.97(0.70–1.33)

961

112(11.7%)

1.06(0.84–1.33)

 

6–10 cars/min

663

97(14.6%)

1.17(0.85–1.63)

212

29(13.7%)

1.24(0.82–1.87)

 

>10 cars/min

537

81(15.1%)

1.19(0.84–1.68)

31

2

-

NOx (μg/m3)

0–8

13

1

-

1824

215(11.8%)

1.00

 

8–11

46

6

-

1792

205(11.4%)

0.96(0.79–1.18)

 

11–14

562

65(11.6%)

1.00

1268

142(11.2%)

0.93(0.74–1.16)

 

14–19

1325

146(11.0%)

0.90(0.66–1.23)

510

57(11.2%)

0.95(0.69–1.29)

 

>19

1698

254(15.0%)

1.28(0.95–1.72)

127

8(6.3%)

0.50(0.24–1.04)

   

p-trend

0.002

 

p-trend

0.344

  1. a Adjusted for age, sex, and smoking. [OR (95%CI)].