Clinical characteristics of the Vlagtwedde-Vlaardingen cohort at the last survey.

Data are presented as mean (standard deviation) or * median (range);
FEV1 = forced expiratory volume in one second; VC = vital capacity; COPD = Chronic Obstructive Pulmonary Disease; GOLD = Global Initiative for Chronic Obstructive Lung Disease; GOLD stage I = mild COPD; GOLD stage II = moderate COPD; GOLD stage III = severe COPD; # According to ATS/ERS standards [35].

数据以均值（标准差）或*中位数（极差）表示；
FEV1=一秒用力呼气容积（forced expiratory volume in one second）；VC=肺活量（vital capacity）；COPD=慢性阻塞性肺疾病（Chronic Obstructive Pulmonary Disease）；GOLD=慢性阻塞性肺疾病全球倡议（Global Initiative for Chronic Obstructive Lung Disease）；GOLD I期=轻度慢性阻塞性肺疾病；GOLD II期=中度慢性阻塞性肺疾病；GOLD III期=重度慢性阻塞性肺疾病；
# 依据美国胸科学会/欧洲呼吸学会（ATS/ERS）标准[35]。