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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.