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Table 1 Anthropometrics, pulmonary functions, cardio-pulmonary exercise capacity. Values are presented as median [IQR]

From: Modeling the oxygen uptake kinetics during exercise testing of patients with chronic obstructive pulmonary diseases using nonlinear mixed models

  COPD disease stage
  II III IV
Anthropometrics    
Subjects, n 21 30 10
Female/male 10/11 10/20 5/5
Age, yr 72.0 [59.0–77.0] 67.5 [61.0–71.0] 60.5 [52–62]
BMI (kg/m2) 28.1 [25.5–32.0] 24.3 [21.8–28.0] 20.0 [18.8–20.6]
Pulmonary functions    
FEV1, L 1.6 [1.3–1.8] 1.0 [0.8–1.1] 0.7 [0.7–0.8]
FEV1, % predicted 59.0 [58.0–66.0] 36.5 [34.0–42.0] 26.5 [26.0–28.0]
FEV1/FVC, ratio 0.6 [0.5–0.6] 0.4 [0.3–0.5] 0.4 [0.3–0.4]
Exercise capacity    
6MWD, m 370.0 [300.0–438.0] 352.5 [290.0–392.0] 345.0 [265.0–374.0]
  1. BMI: body mass index; FEV1: forced expiratory volume in 1 sec; FEV1/FVC ratio: forced expiratory volume in 1 sec (FEV1) expressed as percent of the forced vital capacity (FVC); 6MWD: 6-minute walking distance