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Table 4 Prevalence (%) of respiratory symptoms and asthma by study year and smoking habits

From: Prevalence trends in respiratory symptoms and asthma in relation to smoking - two cross-sectional studies ten years apart among adults in northern Sweden

  

Non-smokers

Ex-smokers

Smokers

 
 

Year

%

Diff by year

%

Diff by year

%

Diff by year

Diff by smoking

   

P-value

 

P-value

 

P-value

P-value

Asthma variables

        

Ever asthma

1996

9.9

 

11.1

 

9.4

 

0.257

 

2006

12.3

0.002

15.0

0.002

14.3

<0.001

0.021

Physician-diagnosed

1996

9.0

 

11.0

 

8.3

 

0.023

asthma

2006

10.6

0.023

12.0

0.053

11.8

0.001

0.026

Asthma medication

1996

10.7

 

12.0

 

10.5

 

0.322

 

2006

11.2

0.453

14.8

0.026

12.7

0.058

0.003

Bronchitis variables

        

Longstanding cough

1996

11.7

 

10.0

 

15.6

 

<0.001

 

2006

7.8

<0.001

10.8

0.485

16.1

0.712

<0.001

Sputum production

1996

16.1

 

16.9

 

26.3

 

<0.001

 

2006

12.1

<0.001

14.9

0.157

23.7

0.098

<0.001

Chronic productive cough

1996

6.4

 

6.4

 

10.2

 

<0.001

 

2006

5.1

0.027

6.6

0.879

9.3

0.436

<0.001

Wheeze variables

        

Any wheeze

1996

14.4

 

17.0

 

27.6

 

<0.001

 

2006

14.2

0.836

19.0

0.175

31.2

0.029

<0.001

Recurrent wheeze

1996

9.5

 

12.4

 

21.4

 

<0.001

 

2006

8.6

0.156

13.0

0.668

21.1

0.848

<0.001

Asthmatic wheeze

1996

6.1

 

8.5

 

10.8

 

<0.001

 

2006

5.7

0.469

9.0

0.591

10.5

0.834

<0.001

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World Allergy Organization Journal

ISSN: 1939-4551

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