Table 1.
Baseline Characteristics of COPD Patients Included in the Study (n=396)
| Factors | Mean ± SD or N (%) |
|---|---|
| Age (yr) | 73.1 ± 9.5 |
| Male (%) | 382 (96.5) |
| Smoking history (pack-yr) | 31.7±18.5 |
| Body mass index (BMI) | 23.5 ± 4.1 |
| FVC (% of predicted value) | 79.7±16.7 |
| FEV1/FVC (%) | 52.7 ± 10.6 |
| FEV1 (% of predicted value) | 55.2 ± 18.2 |
| DLCO (%) | 68.5 ± 21.0 |
| GOLD Stage (%) | |
| GOLD I | 46 (11.6) |
| GOLD II | 187 (47.2) |
| GOLD III | 140 (35.4) |
| GOLD IV | 23 (5.8) |
| MIP | 72.2 ± 30.5 |
| MEP | 98.3 ± 46.8 |
| CCI | 3.3 ± 2.8 |
| BODE index | 3.0 ± 2.1 |
| BODE Quartile: Q1, Q2, Q3, Q4 (%)a | |
| Quartile 1 | 188 (47.5) |
| Quartile 2 | 109 (27.5) |
| Quartile 3 | 71 (17.9) |
| Quartile 4 | 28 (7.1) |
| mMRC | 1.72 ± 0.9 |
| mMRC Dyspnea Scale | |
| Scale 0/1/2/3/4 | 25/133/173/56/9 |
| 6MWD (m) | 351.9 ± 111.6 |
Notes: aQuartile 1 was defined by a score of 0–2, quartile 2 by a score of 3–4, quartile 3 by a score of 5–6, and quartile 4 by a score of 7–10.
Abbreviations: BMI, body mass index; CCI, Charlson comorbidity index; 6MWD, 6 mins walking distance; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; MRC score, Medical Research Council dyspnea scale; BODE index, composite index of Body mass index, airflow maximum expiratory pressure Obstruction, Dyspnea, and Exercise capacity; MIP, maximum inspiratory pressure; MEP, maximum expiratory pressure.