RESUMO
Objective: To investigate the prevalence and influencing factors on respiratory disease related symptoms (coughing, expectoration, persistent coughing and persistent expectoration) in Chinese people ≥40 years old. Methods: Data was collected from 162 surveillance points in the China Non-communicable and Chronic Disease Surveillance Project in 2010. A total number of 56 066 people, aged ≥40 years, were selected by multi-stage cluster random sampling method in this study. The prevalence rates of coughing, expectoration, persistent coughing and persistent expectoration were calculated according to gender by χ(2) test. Multivariate logistic regression model was used to analyze the related influencing factors. Results: The prevalence rates of coughing, persistent coughing, expectoration and persistent expectoration in men were significantly higher than that in women (P<0.01). The prevalence rate of respiratory symptoms was positively correlated with age and duration and amount of cigarette smoking (P<0.01), while negatively correlated with participants'education level (P<0.01). Results from multivariate logistic regression analysis showed that gender, age, education level, smoking-related parameters, areas of residency (in urban or rural areas), etc. were appeared as influencing factors on the prevalence of respiratory symptoms. Conclusion: The symptoms of chronic respiratory diseases appeared prevalent in Chinese population aged ≥40 years. Factors as older age, living in the central/western regions and smoking-related parameters were identified as of higher risks.