Table 3.
Association between patient characteristics and accuracy of COPD diagnosis
| Characteristic | COPD diagnosis; OR (95% CI)* | ||
|---|---|---|---|
| Undiagnosed COPD v. no COPD | Correctly diagnosed COPD v. overdiagnosed COPD | Undiagnosed COPD v. correctly diagnosed COPD | |
| Age > 63 yr | 1.30 (0.67–2.54) | 1.00 (0.40–2.46) | 0.58 (0.24–1.41) |
| Female sex | 0.91 (0.48–1.74) | 1.64 (0.70–3.83) | 0.85 (0.36–1.99) |
| Current smoker | 1.12 (0.52–2.44) | 0.76 (0.30–1.91) | 0.44 (0.17–1.11) |
| No. of respiratory symptoms* | 1.05 (0.82–1.35) | 1.34 (1.01–1.79) | 0.62 (0.46–0.84) |
| No. of visits to primary care physician because of respiratory problem | 1.51 (0.93–2.45) | 1.25 (0.77–2.04) | 1.01 (0.97–1.06) |
Note: CI = confidence interval, COPD = chronic obstructive pulmonary disease, OR = odds ratio.
*
For age, ORs are for participants older than the median age of 63 years; for the number of respiratory symptoms, ORs are for each additional symptom; for the number of visits to a primary care physician because of respiratory problem, ORs are for each additional visit per patient-year.