To understand the current status of the use of inhaled bronchodilator and inhaled steroids, which are the core treatment for patients with chronic airway diseases, and to provide important clinical information, the study was conducted as follows: 

1) the current status of the prescription for and the use of inhaled bronchodilator and inhaled steroids in the country was examined using the Health Insurance Review & Assessment Service's claims data, and the incidence of diseases depending on the drug use was compared. 

2) Clinical changes such as disturbed urination, frequency of dry mouth, and depression/anxiety after the use of inhaled drug treatment, which are difficult to find out from the analysis of the Health Insurance Review & Assessment Service's claims data, were examined by conducting the survey on patients.