Table 3.
Severity of COPD airflow limitation (AFL) and mortality within the three differing severity classifications
| Severity of COPD by AFL | COPD-X (n=238)* |
GOLD (n=238) |
GLI-2012 (n=238) |
| Mild | 35 (15%) | 5 (2%) | 16 (7%) |
| Moderate | 96 (40%) | 78 (33%) | 43 (18%) |
| Severe | 102 (43%) | 97 (41%) | 83 (35%) |
| Very severe | – | 58 (24%) | 96 (40%) |
| Mortality (all cause) |
COPD-X (n=38) |
GOLD (n=38) |
GLI-2012 (n=35) |
| Mild | 2 (5%) | 0 (0%) | 1 (3%) |
| Moderate | 10 (26%) | 6 (16%) | 3 (9%) |
| Severe | 26 (68%) | 15 (39%) | 10 (29%) |
| Very severe | – | 17 (45%) | 21 (60%) |
*Five patients had FEV1 >80% which are unclassified according to COPD-X criteria.
COPD, chronic obstructive pulmonary disease; COPD-X, concise tool for chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; GLI, global lung initiative; GOLD, global initiative for chronic obstructive lung disease.