From: Diverging trends of chronic bronchitis and smoking habits between 1998 and 2010
RR [95% CI] | |||
---|---|---|---|
ISAYA (1998/2000) | GEIRD (2007/2010) | p-value for heterogeneity† | |
Gender (female vs male) | 1.17 [1.09−1.27] | 1.11 [1.00−1.22] | 0.721 |
Smoking habits (vs never smoking): | |||
Past light smoking | 1.40 [1.21−1.62] | 1.03 [0.86−1.23] | 0.015 |
Past heavy smoking | 2.47 [1.96−3.13] | 1.66 [1.19−2.31] | 0.151 |
Current light smoking | 2.15 [1.95−2.37] | 1.95 [1.73−2.19] | 0.144 |
Current heavy smoking | 4.82 [4.31−5.39] | 3.57 [3.11−4.11] | 0.018 |
Occupational status (unemployed/retired subject vs employed subject/house-person/student) | 1.11 [0.97−1.28] | 1.53 [1.31−1.79] | 0.019 |
Asthma (present vs absent) | 2.08 [1.84−2.34] | 2.01 [1.77−2.30] | 0.635 |
Allergic rhinitis (present vs absent) | 1.76 [1.60−1.93] | 1.81 [1.63−2.02] | 0.680 |