Characteristics of the 266 study participants.
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aairflow limitation was defined as FEV1/FVC ratio less than 70% and classified as mild (FEV1≥80%), moderate (50%≤FEV11SD = Standard deviation; FEV1 = forced expiratory volume in the first second; FEV1/FVC = ratio of FEV1 over forced vital capacity
创建时间：
2015-12-02
