Self-reported physician diagnosis of bronchitis or emphysema according to GOLD stages
| No chronic respiratory symptoms and no lung function abnormality | GOLD zero (chronic respiratory symptoms and no lung function abnormality) | Restrictive disease (FEV1/FVC≥0.7 and FVC<80% predicted) | GOLD I | GOLD II | GOLD III/IV | p Value* | |
|---|---|---|---|---|---|---|---|
| Self Report (Yes) | 633 (6.5%) | 65 (20.9%) | 64 (10.4%) | 143 (10.1%) | 201 (17.5%) | 89 (34.1%) | |
| No | 9083 (93.5%) | 246 (79.1%) | 551 (89.6%) | 1269 (89.7%) | 949 (82.5%) | 172 (65.9%) | <0.0001 |
*χ2 test.
FEV, forced expiratory volume; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease.