Table 1: General characteristics of patients enrolled.

VariablesActive group
( )
Control group
( )

Age, years66.8 ± 7.367.0 ± 9.80.941
Sex, M/F24/620/100.243
BMI, kg m225.4 ± 3.325.7 ± 4.10.727
COPD2 (6)4 (13)0.389
LTOT2 (6)3 (10)0.640
, %28.0 ± 5.632.0 ± 4.00.413
Drop-out2 (6)2 (6)1
Cardiothoracic surgical intervention0.622
 CABG10 (33)7 (23)
 Aortic valve replacement8 (26)11 (36)
 Mitral valve repair4 (13)5 (16)
 Mitral valve replacement2 (6)3 (10)
 Pulmonary lobectomy4 (13)3 (10)
 Pulmonary resection 2 (6)0 (0)
 Pneumonectomy0 (0)1 (3)

Variables described as mean ± SD or as frequency (%).
Defined in LTOT patients only.
BMI: body mass index; COPD: chronic obstructive pulmonary disease; LTOT: long-term oxygen therapy; FiO2: inspiratory fraction of oxygen; CABG: coronary artery bypass graft.