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Distribution of GOLD 20171 A/B/C/D groups at the baseline according to airflow limitation severity (Grades I–IV) in 524 COPD subjects
| Airflow obstruction (grade) | Symptoms classification | n (%) |
|---|---|---|
| I (n=323) | A | 253 (78.3) |
| B | 62 (19.2) | |
| C | 3 (0.9) | |
| D | 5 (1.6) | |
| II (n=167) | A | 98 (58.7) |
| B | 58 (34.7) | |
| C | 4 (2.4) | |
| D | 7 (4.2) | |
| III (n=27) | A | 11 (40.7) |
| B | 11 (40.7) | |
| C | 1 (3.7) | |
| D | 4 (14.8) | |
| IV (n=7) | A | 1 (14.3) |
| B | 3 (42.9) | |
| C | 2 (28.6) | |
| D | 1 (14.3) |
Abbreviation: GOLD, Global Initiative for Chronic Obstructive Lung Disease.
