Table 1.
GOLD classification parameters at index
| Overall COPD cohort (N=44,201), n (%) | |
|---|---|
| FEV1 (at least one test recorded) | 32,908 (74.5) |
| Mild: FEV1 ≥80% predicted | 5,628 (18.7) |
| Moderate: 50% ≤ FEV1 <80% predicted | 15,427 (51.3) |
| Severe: 30% ≤ FEV1 <50% predicted | 7,387 (24.6) |
| Very severe: FEV1 <30% predicted | 1,634 (5.4) |
| mMRC Dyspnea Scale (at least one score recorded) | 36,914 (83.5) |
| Grade 0 | 6,105 (16.5) |
| Grade 1 | 13,077 (35.4) |
| Grade 2 | 9,596 (26.0) |
| Grade 3 | 6,418 (17.4) |
| Grade 4 | 1,718 (4.7) |
| Number of exacerbations | |
| 0 | 19,948 (45.1) |
| 1 | 11,371 (25.7) |
| 2+ | 12,882 (29.2) |
Abbreviations: COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in one second; GOLD, Global Initiative for Chronic Obstructive Lung Disease; mMRC, modified Medical Research Council.