The changing epidemiology of asthma in Shanghai, China
Journal of Asthma
Objectives-To investigate the prevalence of bronchial asthma in Putuo district in Shanghai, China. Methods-Cross-sectional, community-based study with random sampling of a district with a population of one million. These subjects were residents of the district and 6 or more years of age. Questionnaire and spirometry were completed in all subjects. Asthma was defined as physiciandiagnosed asthma. Results-We surveyed 27,042 participants, of which 46.3% were male, and 53.7% were female. The
... nce of asthma was 1.80% (488/27,042). Asthma prevalence in males was 2.11%, which was significantly higher than 1.54% in females. The prevalence of allergic rhinitis, chronic urticuria or eczema in asthmatic population was 35.45%, 9.02% and 3.48%, respectively. However, the proportions of these allergic diseases in total population were 4.49%, 0.86% and 0.73%. 39.34% asthmatic subjects had a family history of asthma. The most prominent causes of asthma attack were cold air, respiratory infection, dust inhalation and exercise. Pulmonary function of 428 asthma patients was analyzed: 228 (53.27%) patients had FEV1%pred lower than 80%. Patients older than 65 year had lower FEV1%pred than other age groups (P<0.01). Conclusions-The prevalence of physician-diagnosed asthma in urban of Shanghai has increased in recent years. The most important causes of asthma attack were cold air, respiratory infection and dust exposure. The proportion of individual with decreased percent predicted FEV1 increased with age. Strengthening the prevention and treatment of asthma, especially in children with asthma, may decrease the population burden of asthma.