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Table 4 Adjusted prevalence of CB according to the presence of asthma and allergic rhinitis

From: Diverging trends of chronic bronchitis and smoking habits between 1998 and 2010

  

Adjusted prevalence (%) [95% CI]

 
  

ISAYA (1998/2000)

GEIRD (2007/2010)

p-value†

Asthma*

Absent

11.0 [10.5−11.5]

10.7 [9.7−11.8]

0.665

 

Present

31.2 [29.9−32.5]

33.3 [31.5−35.1]

0.144

Allergic rhinitis*

Absent

10.5 [10.2−10.9]

9.7 [8.8−10.6]

0.124

 

Present

19.9 [19.0−20.8]

21.2 [20.0−22.5]

0.163

  1. * prevalence obtained by stratifying on asthma/allergic rhinitis and adjusted for gender, age, season of response, type of contact, cumulative response rate, and centre.
  2. † p-value obtained by testing the null hypothesis that the regression coefficient of the dummy indicator of the study (GEIRD vs ISAYA) was zero.
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Respiratory Research

ISSN: 1465-993X

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