Table 3.
Diagnostic risk classification of COPD by symptoms and signs for COPD defined as panel diagnosis, FEV1/FVC < 0.7, and FEV1/FVC < LLN, in 400 patients with persistent cough
| COPD panel diagnosis | COPD FEV1/FVC < 0.7 | COPD FEV1/FVC < LLN | ||||
|---|---|---|---|---|---|---|
| Estimated diagnostic risk by regression model | Participants, n (% of 400) | COPD present, n (%) | Participants, n (% of 400) | COPD present, n (%) | Participants, n (% of 400) | COPD present, n (%) |
| 0–20% (low) | 187 (47) | 16 (9) | 121 (30) | 13 (11) | 187 (47) | 20 (11) |
| 20–80% (intermediate) | 199 (50) | 92 (46) | 274 (69) | 117 (43) | 213 (53) | 63 (30) |
| 80–100% (high) | 14 (4) | 10 (71) | 5 (1) | 4 (80) | 0 (0) | 0 (0) |
| Total n | 400 | 118 | 400 | 134 | 400 | 83 |
FEV1 = forced expiratory volume in 1 second. FVC = forced vital capacity. LLN = lower limit of normal.