Table 1. Baseline characteristics of study participants.
| Variables | Total (n=88) | Intervention (n=41) | Control (n=47) | P value |
|---|---|---|---|---|
| Age (years), median (IQR) | 68.0 (62.0‐73.0) | 67.0 (59.0‐71.0) | 69.0 (63.3‐73.0) | .10 |
| Male sex, n (%) | 72 (81.8) | 36 (87.8) | 36 (76.6) | .14 |
| Height (cm), median (IQR) | 165.0 (159.1‐169.0) | 166.0 (159.1‐170.1) | 164.0 (159.3‐168.0) | .28 |
| Body weight (kg), median (IQR) | 65.0 (56.0‐73.0) | 67.0 (56.5‐77.0) | 64.0 (6.0‐71.0) | .25 |
| BMI (kg/m2), median (IQR) | 24.1 (21.7‐26.7) | 24.9 (21.9‐27.5) | 24.0 (21.7‐26.4) | .56 |
| Respiratory disease, n (%) | .26 | |||
| COPDa | 85 (96.6) | 41 (100.0) | 44 (93.6) | |
| Asthma | 2 (2.3) | 0 (0.0) | 2 (4.3) | |
| Bronchiectasis | 1 (1.1) | 0 (0.0) | 1 (2.1) | |
| Duration of disease (years), median (IQR) | 4.9 (2.1‐9.7) | 4.8 (1.9‐9.4) | 5.0 (2.2‐10.1) | .51 |
| Ever-smokers, n (%) | 70 (79.5) | 34 (82.9) | 36 (76.6) | .47 |
| Amount, pack-years (n=70), median (IQR) | 40.0 (20.0‐45.0) | 35.0 (22.5‐45.0) | 40.0 (20.0‐45.0) | .72 |
| Lung function, median (IQR) | ||||
| FEV1b (% predicted) | 63.0 (50.5‐71.5) | 63.0 (53.0‐71.3) | 63.0 (48.3‐71.8) | .98 |
| FVCc (% predicted) | 83.0 (73.5‐88.5) | 84.0 (75.5‐89.3) | 81.0 (73.0‐87.8) | .57 |
| FEV1/FVC | 0.54 (0.44‐0.62) | 0.54 (0.45‐0.62) | 0.54 (0.43‐0.64) | .88 |
a
COPD: chronic obstructive pulmonary disease.
b
FEV1: forced expiratory volume in one second.
c
FVC: forced vital capacity.