Characteristics of the 2,026 adults who participated in both examinations and had a valid spirometry test.

BMI = weight/ height2; COV = Coefficient of variability, expressed as medians, 25th and 75th percentiles. SD = Standard deviation; FET = forced expiratory time; pre-BD = before bronchodilator; post-BD = after Bronchodilator. Good quality = three acceptable tests with two best FEV1 and FVC within Characteristics of the 2,026 adults who participated in both examinations and had a valid spirometry test.

BMI（Body Mass Index，身体质量指数）= 体重/身高平方；COV（Coefficient of variability，变异系数）以中位数、第25百分位数及第75百分位数进行表述。SD（Standard deviation，标准差）；FET（forced expiratory time，用力呼气时间）；pre-BD（before bronchodilator，支气管舒张剂给药前）；post-BD（after bronchodilator，支气管舒张剂给药后）。优质检测的判定标准为三项合格测试，且其中两项最优的FEV1（Forced Expiratory Volume in 1 Second，第一秒用力呼气容积）与FVC（Forced Vital Capacity，用力肺活量）符合要求。本内容针对同时参与两次检查且具备有效肺功能测试结果的2026名成年人的特征。