Table 5.
Independent predictive values of smoking, respiratory symptoms, and chest signs for COPD (FEV1/FVC < 0.7) and severe COPD (FEV1/FVC < 0.7 and FEV1% predicted <50), as evaluated by multivariate logistic regression in 351 patients diagnosed with asthma or COPD
| COPD
|
Severe COPD
|
|||
|---|---|---|---|---|
| Odds ratio | CI | Odds ratio | CI | |
| Male sex | 1.8 | 1.1–3.2 | NS | |
| Age | 2.7 | 1.6–4.7 | 2.4 | 1.1–5.1 |
| Pack years | ||||
| ≥20–40 | 4.9 | 2.7–8.8 | NS | |
| ≥40 | 3.3 | 1.3–8.3 | NS | |
| Short of breath doing physical activities the previous week | ||||
| Several times | NS | 1.7 | 1.1–2.5 | |
| Many times | NS | 1.5 | 1.1–2.0 | |
| A great many times | NS | 8.4 | 2.7–25.8 | |
| Chest signs | ||||
| Wheezes/rhonchi | 2.3 | 1.1–4.8 | NS | |
| Diminished breath sounds | 5.0 | 2.2–11.3 | 4.4 | 2.0–9.8 |
| Hyperresonance to percussion | 6.7 | 2.0–22.0 | 5.3 | 2.0–13.7 |
Abbreviations: COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; CI, confidence interval; NS, not significant.