Table 1. Clinical and demographic variables.

Variable	Progressive group (n = 6)	Relatively Stable group (n = 6)
Age	64.8±6.7	66.7±5.5
Sex male/female	5/1	3/3
Smoking status
never	3	2
ever	3	4
current	1	1
% predicted DLCO baseline	58.7±11.0	56.0±10.9
Actual change in DLCO	−6.4±1.5	−2.50±3.34
Change in % predicted DLCO	−20.8±4.8	−2.33±21.77
% predicted FVC baseline	61.2±18.1	68.0±16.9
Actual change in FVC	−0.73±0.4	−0.24±0.5
Change in % predicted FVC	−16.0±7.8	−4.17±13.9

The percent predicted DLCO and FVC values at baseline, as well as the changes in actual and predicted (DLCO or FVC) values over a 12 months period are indicated as the mean with standard deviation for each group.