Table 2.

Pulmonary function test values of enrolled subjects with COPD.

	Hypercapnia	Normocapnia	p Value
	(n = 22)	(n = 102)
FVC, L	1.97 (1.40–2.57)	2.89 (2.33–3.47)	<0.001
%FVC, %	65.85 (51.40–82)	97.3 (84.85–110.07)	<0.001
FEV1, L	0.8 (0.66–1.31)	1.73 (1.32–2.19)	<0.001
%FEV1, %	36.82 (29.1–62.95)	74.7 (55.12–84.45)	<0.001
FEV1%, %	53.71 (31.88–68.94)	63.15 (50.84–71.19)	0.228
PEF, L	2.98 (2.54–4.18)	5.11 (3.76–6.69)	0.781
%PEF, %	39.20 (29.55–39.20)	69.35 (48.02–81.15)	<0.001
V50, L	0.58 (0.21–1.43)	1.15 (0.65–1.89)	0.044
%V50, %	18.35 (7.15–67.75)	35.05 (19.27–61.4)	0.101
V25, L	0.14 (0.12–0.34)	0.26 (0.16–0.42)	0.006
%V25, %	18.1 (10.72–29.27)	27.2 (16.22–39.57)	0.015