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Table 8 Stratification on smoking. COPD diagnosis in relation to traffic among smokers/ex-smokers and non-smokers.

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

  

Smokers/ex-smokers

Non-smokers

  

n

COPD D

OR a

n

COPD D

OR a

Heavy traffic

No

3149

167(5.3%)

1.00

2892

76(2.6%)

1.00

 

Yes

1861

130(7.0%)

1.43(1.13–1.82)

1414

42(3.0%)

1.19(0.81–1.76)

Heaviest road within <100 m

no heavy road

1951

104(5.3%)

1.00

1804

49(2.7%)

1.00

 

<2 cars/min

1185

67(5.7%)

1.06(0.77–1.45)

1050

28(2.7%)

0.99(0.62–1.59)

 

2–5 cars/min

992

52(5.2%)

0.99(0.70–1.40)

828

19(2.3%)

0.88(0.51–1.51)

 

6–10 cars/min

522

44(8.4%)

1.56(1.08–2.26)

364

16(4.4%)

1.64(0.92–2.94)

 

>10 cars/min

344

28(8.1%)

1.84(1.18–2.86)

234

6(2.6%)

1.15(0.48–2.75)

NOx (μg/m3)

0–8

969

47(4.9%)

1.00

886

27(3.0%)

1.00

 

8–11

971

47(4.8%)

0.96(0.63–1.46)

884

21(2.4%)

0.77(0.43–1.37)

 

11–14

945

63(6.7%)

1.35(0.92–2.00)

910

24(2.6%)

0.92(0.52–1.61)

 

14–19

1037

60(5.8%)

1.14(0.92–2.00)

821

23(2.8%)

0.85(0.48–1.50)

 

>19

1072

78(7.3%)

1.61(1.11–2.35)

779

23(3.0%)

1.12(0.63–1.98)

Test för

Heavy traffic*eversmoker

p = 0.47

   

Interaction

Heaviestroad100 m*eversmoker

p = 0.89

   
 

NOx*eversmoker

p = 0.83

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