Comparison of symptoms, previous exacerbations, health status and systemic biomarker levels between the study groups.

Values are mean ± SD or frequency. Abbreviations: BMI = body mass index; mMRC = modified Medical Research Council dyspnea scale; SGRQ = St. George's Respiratory Questionnaire; EQ-5D = EuroQol 5 Dimensions questionnaire; VAS = Visual analogue scale; LCADL = London Chest Activities of Daily Living; CRP = C-reactive protein; TNF = tumor necrosis factor; IL = interleukin; NOx = nitrites/nitrates.Comparisons between groups by ANOVA with Bonferroni post-hoc comparisons: †p‡p¶p§p数据以均值±标准差（standard deviation，SD）或频数表示。缩写说明：BMI=体重指数（body mass index）；mMRC=改良医学研究委员会呼吸困难量表（modified Medical Research Council dyspnea scale）；SGRQ=圣乔治呼吸问卷（St. George's Respiratory Questionnaire）；EQ-5D=欧洲五维健康量表（EuroQol 5 Dimensions questionnaire）；VAS=视觉模拟评分法（Visual analogue scale）；LCADL=伦敦胸部日常生活活动量表（London Chest Activities of Daily Living）；CRP=C反应蛋白（C-reactive protein）；TNF=肿瘤坏死因子（tumor necrosis factor）；IL=白细胞介素（interleukin）；NOx=亚硝酸盐/硝酸盐（nitrites/nitrates）。组间比较采用单因素方差分析（analysis of variance，ANOVA）结合邦费罗尼事后检验：†p、‡p、¶p、§p。