Objective  To investigate the prevalence and influencing factors of chronic obstructive pulmonary disease (COPD) among residents aged 40 and above in Jiangsu province and to provide evidences for prevention and control of the disease.

  Methods  With multistage cluster random sampling, we recruited 3 600 residents aged 40 and above in 6 surveillance areas of Jiangsu province and carried out a questionnaire interview, physical examination and lung function test among the residents during July – December 2015. Patients with COPD were diagnosed according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD). The prevalence of COPD was estimated with complicated sampling weights. Influencing factors of COPD were analyzed with multivariate logistic regression model.

  Results  Among the 3 365 participants completing the survey, totally 428 were diagnosed with COPD and the estimated prevalence of COPD was 11.9%. Of the 428 COPD patients, 68.7%, 27.1%, 3.7% and 0.5% were classified into GOLD stage Ⅰ, Ⅱ, Ⅲ and Ⅳ, respectively. Multivariate logistic regression analysis indicated that male gender, aged 50 years and older, with the education of junior high school and below, being a former smoker, being a current smoker, with the history of serious respiratory disease during childhood, with the history of exposure to occupational hazards, and lower body weight were risk factors for COPD and obesity was protective factor for COPD among the participants.

  Conclusion  The prevalence of COPD was relatively high and influenced mainly by gender, age, education, smoking, body mass index, history of serious respiratory disease during childhood and exposure to occupational hazards among residents aged 40 and above in Jiangsu province.