Clinical characteristics of patients with COPD.

BMI, body mass index. FEV1%, forced expiratory volume in one second (% predicted).FVC%, forced vital capacity (% predicted). MMRC, modified medical research council dyspnea scale. 6MWD, six-minute walk distance. TLC, total lung capacity.IC, inspiratory capacity. BODE, body mass index, obstruction, dyspnea and exercise capacity index.ns = non significant.*mean±SD.**median; 25–75th percentiles.

BMI：身体质量指数（body mass index）。FEV1%：一秒用力呼气容积占预计值百分比（forced expiratory volume in one second (% predicted)）。FVC%：用力肺活量占预计值百分比（forced vital capacity (% predicted)）。MMRC：改良英国医学研究委员会呼吸困难量表（modified medical research council dyspnea scale）。6MWD：六分钟步行距离（six-minute walk distance）。TLC：肺总量（total lung capacity）。IC：深吸气量（inspiratory capacity）。BODE指数：体重指数、气道阻塞、呼吸困难与运动能力指数（body mass index, obstruction, dyspnea and exercise capacity index）。ns：无统计学意义（non significant）。*均值±标准差。**中位数；25~75百分位数。