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Table 3 Adjusted percentage* of past/current smokers, unemployed/retired subjects, subjects with asthma, and subjects with allergic rhinitis

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

  Adjusted % [95% CI]  
  ISAYA (1998/2000) GEIRD (2007/2010) p-value
Past light smokers 11.2 [10.9−11.6] 11.7 [11.1−12.2] 0.219
Past heavy smokers 1.2 [1.1−1.3] 0.8 [0.7−1.0] <0.001
Current light smokers 22.5 [22.0−23.1] 19.8 [18.9−20.7] <0.001
Current heavy smokers 7.0 [6.7−7.4] 4.2 [3.8−4.6] <0.001
Unemployed/retired subjects 5.3 [5.1−5.6] 6.0 [5.7−6.3] 0.005
Subjects with asthma 5.0 [4.7−5.3] 6.2 [5.6−6.8] 0.003
Subjects with allergic rhinitis 19.5 [19.2−19.9] 24.5 [23.8−25.2] <0.001
  1. * 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.