FEV1/FEV6 DPD COPD data

this data was collected for evaluation of FEV1/FEV6 as surrogate for FEV1/FVC for COPD diagnosis本数据集系为评估第一秒用力呼气容积/第六秒用力呼气容积（FEV1/FEV6）作为第一秒用力呼气容积/用力肺活量（FEV1/FVC）的替代指标用于慢性阻塞性肺疾病（COPD）诊断而采集。