Distribution of patients by study method
| n (%) | |
|---|---|
| Diferential diagnosis according to spirometry18 | n = 266 |
| COPD without reversible component | 132 (49.6) |
| COPD with reversible component | 28 (10.5) |
| Asthma | 21 (7.9) |
| Probable asthma | 59 (22.2) |
| Probably normal | 26 (9.8) |
| Differential diagnosis questionnaire (Tinkelman et al10) | n = 250 |
| Increased probability of COPD | 157 (62.8) |
| Reduced probability of COPD | 37 (14.8) |
| Indeterminate probability of COPD | 56 (22.4) |
| Differential diagnosis questionnaire (Beeh et al16) | n = 250 |
| Probable COPD | 146 (58.4) |
| Asthma | 104 (41.6) |