Hazard Ratios for COPD Related Events Stratified by GOLD Stage.

*Adjusted for Race/Center (5-levels), Gender and Age, Smoking (3-levels), Pack Years, Hypertension, Education (3-levels) and BMI.*已针对种族/研究中心（5级分类）、性别、年龄、吸烟状态（3级分类）、吸烟包年数、高血压、受教育程度（3级分类）以及身体质量指数（Body Mass Index，BMI）进行校正。