Table 3.

Baseline characteristics of patients with severe COPD cases.

	Tobacco Group	Biomass Group	p
n	156	150
Age	64±12	69±9	0,001
FEV1, % (L/s)	35±4 (1,04±0,24)	43±5 (0,91±0,17)	0,001
FVC, % (L)	51±9 (1,90±0,42)	57±7 (1,46±0,26)	0,001
PaO2, mm Hg	43 ± 10	45 ± 8	>0,05
PaCO2, mm Hg	47 ± 12	52 ± 9	0,001
PH frequency, %	53,8	60	>0,05