Grade of airflow limitation in COPD subjects
| Post-bronchodilator FEV1, mean±sd | ||||
| GOLD classification | n (%) | L | % pred | |
| GOLD 1 | Mild | 7 (7.8) | 2.7±0.8 | 85.7±4.2 |
| GOLD 2 | Moderate | 40 (44.4) | 1.9±0.6 | 65.5±8.1 |
| GOLD 3 | Severe | 33 (36.7) | 1.2±0.3 | 40.0±5.3 |
| GOLD 4 | Very severe | 10 (11.1) | 0.7±0.2 | 24.4±3.6 |
GOLD: Global Initiative for Chronic Obstructive Lung Disease; FEV1: forced expiratory volume in 1 s; % pred: % predicted.