BMC Medical Research Methodology

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]

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

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