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Classification of patients according to GOLD with the BODE index in each stage (n = 122); the BODE index is given as median and 1st to 3rd quartiles.
| Severity of COPD according to GOLD | Patients, N (%) | BODE index |
| Stage I (FEV1 ≥ 80% predicted) | 6 (5) | 0 (0 to 0) |
| Stage II (50% ≤ FEV1 < 80% predicted) | 39 (32) | 1 (1 to 4) |
| Stage III (30% ≤ FEV1 < 50% predicted) | 31 (25) | 4 (3 to 6) |
| Stage IV (FEV1 ≤ 30% predicted) | 46 (38) | 7 (5 to 8) |
