Baseline characteristics of the total sample and subgroups according to forced expiratory volume in one second (FEV1) % pred
| FEV1 % pred | Total sample | |||
| 79–50 | 49–30 | pred<30 | ||
| Patients n | 22 | 25 | 21 | 68 |
| M:F | 15:7 | 16:9 | 12:9 | 43:25 |
| Age yrs | 64.1±6.4 | 64.8±7.3 | 64.1±6.8 | 64.6±6.8 |
| Disease duration | 6.5±5.3) | 7.5±5.5 | 8.2±4.2 | 7.6±4.7 |
| FEV1 % pred | 60.9±9.0 | 36.4±5.0 | 22.3±5.1 | 39.9±17.0 |
| VC % pred | 83.2±13.9 | 64.7±14.4 | 51.5±14.2 | 66.6±18.9 |
| TLCO % pred | 47.1±25.6 | 34.3±20.9 | 20.7±12.3 | 33.9±22.5 |
| 6MWD | 308.6±86.8 | 261.0±93.1 | 207.4±83.4 | 260.7±95.7 |
| SGRQ total | 36.4±19.1 | 47.5±17.1 | 54.3±14.6 | 46.0±18.3 |
| SIP overall | 4.9±6.8 | 9.9±9.3 | 10.6±7.0 | 8.5±8.1 |
| MACL total | 3.1±0.8 | 3.1±0.5 | 2.9±0.5 | 3.0±0.6 |
Data are presented as mean±sd unless otherwise stated
M: males
F: females
VC: vital capacity
TLCO: carbon monoxide transfer factor
6MWD: 6-min walking distance
SGRQ: St George's Respiratory Questionnaire
SIP: Sickness Impact Profile
MACL: Mood Adjective Check List
Disease duration: years since first occurrence of symptoms