Baseline characteristics of patients
| Completed follow up (n = 336) | Lost to follow up (n = 55) | |
|---|---|---|
| BMI = body mass index; COPD = chronic obstructive pulmonary disease; FVC = forced vital capacity; FEV1 = forced expiratory volume in 1 second; SGRQ = St George’s Respiratory Questionnaire. | ||
| *p<0.05 compared with patients who completed follow up (t test). | ||
| Sex (male), n (%) | 328 (97.6%) | 54 (98.2%) |
| Mean (SD) age (years) | 66.1 (8.2) | 67.1 (9.3) |
| Mean (SD) BMI (kg/m2) | 27.4 (4) | 26.2 (4.0)* |
| Severity of COPD, n (%) | ||
| II (FEV1 35–49%) | 147 (43.8%) | 20 (36.4%) |
| III (FEV1<35%) | 189 (56.3%) | 35 (63.6%) |
| Mean (SD) pack years | 55.0 (30.3) | 65.0 (44.2) |
| Mean (SD) spirometric values | ||
| FVC (ml) | 2222.5 (640.2) | 2208.7 (716.2) |
| FVC (% over predicted) | 53.6 (13.4) | 52.6 (14.6) |
| FEV1 (ml) | 1016.7 (287.4) | 980.9 (290.1) |
| FEV1 (% over predicted) | 33.0 (8.0) | 31.5 (8.1) |
| FEV1/FVC (% over predicted) | 64.2 (13.9) | 63.3 (15.6) |
| Mean (SD) quality of life scores | ||
| SGRQ Symptoms | 48.3 (20.2) | 53.3 (21.8) |
| SGRQ Activity | 62.8 (20.9) | 65.3 (19.4) |
| SGRQ Impacts | 38.7 (17.8) | 41.8 (18.4) |
| SGRQ Total | 47.6 (17.2) | 50.8 (17.2) |