Table 1 Characteristics of study participants

Age (y)

69 (52-72)

52 (32-69)

Sex (F/M), n

3/20

7/13

BMI (kg/m2)

26.8 (25.9-28.7)

25.8 (25-26.5)

Carlson index

1 (1-3)

n/a

Pack-years

60 (40-90)

n/a

FVC, % predicted

79.5 (69-87.2)

n/a

FEV1, % predicted

67 (42.2-72.5)

n/a

FEV1/FVC, % predicted

67 (54-70)

n/a

pO2, mmHg

72 (61.5-80)

n/a

Pco2, mmHg

34.2 (29.5-38)

n/a