Six-Minute Walking Distance Improvement after Pulmonary Rehabilitation Is Associated with Baseline Lung Function in Complex COPD Patients: A Retrospective Study

Table 1

Subjects’ characteristics.

	All patients (n = 75)	Responders (n = 37)	Nonresponders (n = 38)	P value*
Age (yrs)	71±8	69±8	73±7	0.020
Gender (F, M)	11, 64	6, 31	5, 33	0.708
FEV1 (% pred)	57±18	45±14	68±15	<0.001
VC (% pred)	85±16	78±14	92±15	<0.001
FEV1/VC (%)	50±12	45±11	55±10	<0.001
RV (% pred)	162±43	178±43	147±37	0.002
TLC (% pred)	113±17	115±18	111±16	0.256
RV/TLC (%)	57±9	61±9	54±7	<0.001
IC (liters)	2.2±0.6	2±0.6	2.4±0.5	<0.001
TL, CO (% pred)	61±20	55±19	67±19	0.007
BMI (Kg/m^2)	29.7±5.3	29±6	30±5	0.419
PaO2 (mm Hg)	71.2±8.2	69±5	73±10	0.026
PaCO2 (mm Hg)	38.5±4.5	39±5	38±4	0.070
Charlson Index	1.6±0.9	1.8±1	1.4±0.8	0.084

∗Responders versus nonresponders.