SESSION TITLE: Airways 4
SESSION TYPE: Original Investigation Poster
PRESENTED ON: Wednesday, October 26, 2016 at 01:30 PM - 02:30 PM
PURPOSE: The aim of this study was to identify subtypes in patients with mild to moderate airflow limitation and to evaluate clinical and socioeconomic implications of these subtypes.
METHODS: We analyzed data from the fourth Korean National Health and Nutrition Examination Survey and National Health Insurance claims in 2007-2012. Subjects who were 19 years old and more and had forced expiratory volume in 1 second (FEV1) ≥ 60% predicted and a ratio of FEV1 to forced vital capacity (FVC) < 0.7 were included. K-means clustering was performed to explore subtypes. For clustering analysis, six key input variables, age, body mass index (BMI), FEV1 % predicted, the presence or absence of self-reported wheezing, smoking status, and pack-years of smoking, were selected.