... DMM and EDG participated in the design of the study, drafting the manuscript, and interpreting the results. ASB assisted in acquiring the data, drafting the manuscript, and interpreting the ... measures other than lung function are important predictors of impaired function and poor outcomes. Lung function remains, however, the primary means of diagnosing and classifying COPD at the ... the main predictor of interest in our analysis was COPD severity defined by stage of lung function, both pre- and post-bronchodilator, and a separate analysis using FEV1 as a percent of predicted,...