Role of the Emphysema Index Combined with the Chronic Obstructive Pulmonary Disease Assessment Test Score in the Evaluation of Chronic Obstructive Pulmonary Disease

Figure 4

Comparison of pulmonary functions among the four groups. Compared to Group 4, Groups 1 and 2 exhibited statistically significant differences in MVV % predicted, FEV1 % predicted, MEF 50% predicted, and MMEF 25–75% predicted; additionally, significant differences were observed between Groups 1 and 2 and Groups 3 and 4 in FEV1/FVC % predicted. MVV = maximal voluntary ventilation, FEV1 = forced expiratory volume in 1 second, MEF = maximal expiratory flow, MMEF = maximal midexpiratory flow, and FVC = forced vital capacity.