Analysis Of The Current Status Of Lung Function And Airflow Obstruction And Risk Factors Of Airflow Obstruction In Adults In Beijing

Objective:Based on the Beijing Population Health Cohort Study,this paper describes the level of lung function and airflow obstruction among adults in Beijing,analyses the factors influencing airflow obstruction,and explores to establish a predictive model of airflow obstruction.Methods:The Beijing Population Health Cohort Study was conducted during 2017-2018 as a baseline survey,which included more than 20,000 adults aged 18-74 in 16 districts and counties in Beijing.Baseline information of the subjects was collected through electronic questionnaires and physical examinations were conducted.The following methods were used:1.Statistical description of lung function levels and airflow obstruction in adults in Beijing,and analysis of variance in prevalence using chi-square and Cochran-Armitage trend tests;2.Logistic regression was used to analyse the factors influencing airflow obstruction,and subgroup and sensitivity analyses were conducted to test the robustness of the results;3.Exploratory predictive modelling of airflow obstruction using discriminant functions.Results:A total of 21,426 participants were included in this study.Both FEV1 and FVC levels were higher in men than in women(FEV1:2.60 vs.1.90,P<0.001;FVC:3.12 vs.2.27,P<0.001),and both FEV1 and FVC levels were higher in suburban residents than in urban residents(FEV1:2.31 vs.2.04,P<0.001;FVC:2.77 vs.2.47,P<0.001);FEV1/FVC levels were lower in men than in women(83.41 vs.83.82,P=0.046),and FEV1/FVC levels were higher in suburban residents than in urban residents(83.83 vs.83.27,P=0.010).At the level of the radio of FEV1 to the predicted value of FEV1,the difference was not statistically significant between men and women(71.66 vs.71.73,P=0.810),and suburban residents have a higher levels of values than urban residents(74.07 vs.67.20,P<0.001).The crude prevalence of airflow obstruction diagnosed by the LLN criteria was 18.37%and the age-and sex-standardised prevalence was 17.86%.The crude prevalence of airflow obstruction diagnosed by the GOLD criteria was 15.94%and the age-and sex-standardised prevalence was 14.68%.The prevalence of airflow obstruction was statistically different between men and women,between urban and suburban areas,between different levels of education,between groups with different levels of physical activity,between groups with or without the use of exhaust hoods and fans,between groups with or without clean cooking fuels,between groups with different cooking frequencies in the home,and between groups with or without clean heating fuel.Protective factors for airflow obstruction were high education,use of exhaust hoods and fans,cooking fuels being clean and heating fuels being clean.Risk factors were age,urban area and suburban area and frequency of cooking at home greater than or equal to 14 times/week.Conclusion:Airflow obstruction has become an important public-health problem in Beijing.Among the adult population in Beijing,more attention should be paid to older residents,urban residents,people with low educational attainment,people who do not use clean fuels for cooking and heating,people who do not use exhaust hoods and fans,and people who cook frequently at home.