Table 1.
Baseline characteristics and the distribution of subgroups
| Variable | Value |
|---|---|
| No. of patients included | 428 |
| Age, yr | 69.5 ± 8.0 |
| Male sex | 377 (88.1) |
| Height, cm | 164.8 ± 8.9 |
| Weight, kg | 62.1 ± 9.8 |
| Body mass index, kg/m2 | 23.1 ± 7.2 |
| Smoking | |
| Current | 104 (24.4) |
| Former | 256 (60.1) |
| Never | 66 (15.5) |
| Pack-years | 36 (0–174) |
| Chronic bronchitis | 38 (13.9) |
| Modified Medical Research Council | |
| Mean ± SD | 1.47 ± 0.81 |
| Median (IQR) | 1 (1–2) |
| CAT score | |
| Mean ± SD | 14.3 ± 7.1 |
| Median (IQR) | 14 (9–19) |
| History of exacerbations in the past year | |
| Unexpected visit to outpatient clinic (no./yr) | 0 (0–30) |
| Unexpected visits to emergency room (no./yr) | 0 (0–5) |
| ≥ 2 Events in the past year | 59 (13.8) |
| FEV1/FVC | 0.50 ± 0.13 |
| FVC, L | 3.41 ± 0.78 |
| FVC, % | 96.2 ± 17.6 |
| FEV1, L | 1.70 ± 0.58 |
| FEV1, % | 70.0 ± 21.3 |
| GOLD stage | |
| 1 (FEV1 > 80% of predicted) | 130 (30.3) |
| 2 (FEV1 50%–79% of predicted) | 223 (52.1) |
| 3 (FEV1 30%–49% of predicted) | 70 (16.4) |
| 4 (FEV1 < 30% of predicted) | 5 (1.2) |
| GOLD subgroup | |
| A | 94 (22.0) |
| B | 213 (49.8) |
| C | 13 (3.0) |
| D | 108 (25.2) |
Values are presented as mean±SD, number (%), or median (interquartile range).
SD, standard deviation; IQR, interquartile range; CAT, chronic obstructive pulmonary disease (COPD) assessment test; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease.