Prevalence of Chronic Bronchitis in the Northwest of Iran: Results of the Pilot Phase of the Azar Cohort Study

Document Type: Original Article

Authors

1 Social Determinant of Health Research Center, Tabriz University of Medical Sciences, Tabriz, Iran

2 Department of Statistics and Epidemiology, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, Iran

3 Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran

4 Road Traffic Injury Research Center, Tabriz University of Medical Sciences, Tabriz, Iran

Abstract

Background and aims: Although chronic bronchitis is markedly under-diagnosed in the general
population, it has a significant impact on the health status and the well-being of patients as well as
healthcare resource consumption. This study aimed to determine the prevalence of chronic bronchitis
and its correlates in the northwest of Iran.
Methods: In 2014, all residents aged 35 and over in Khameneh city, East Azerbaijan, were invited to
participate in the pilot phase of the Azar cohort study. The respiratory symptoms questionnaires were
filled out by two trained general practitioners. Participants with a cough and phlegm on most days
during at least three successive months in the previous two years were classified as chronic bronchitis
group. Chi-square test was used to compare the chronic bronchitis and smoking status between males
and females.
Results: A total of 1036 participants were interviewed, 1006 of whom had completed a respiratory
questionnaire, from them 544 (54.1%) were females, and 462 (45.9%) were males. The mean age
was 52.5 ± 10.5 years. The prevalence of smoking was 16.2%. According to the chronic bronchitis
definition, 24 (2.4%) subjects were classified with chronic bronchitis, and the prevalence was higher
in the males (4.1%) than that in the females (0.9%). The prevalence was higher among the active
smokers and ex-smokers compared to non- smokers (8.6% and 4.1% vs. 0.8%). The prevalence of
cigarette smoking was 16.2% and it was higher in the males than that in the females (33.5% vs. 1.5%).
Conclusion: the prevalence of chronic bronchitis in the population of the region under study was
relatively low in comparison to the other parts of Iran and its prevalence was higher in the males than
that in the females.

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