Table 2.
Table of Prior Known COPD status vs. Spirometry COPD Diagnosis
| Characteristic | Overall Population (N = 2514) | Prior Diagnosis of COPD (N = 527) n (%) |
No prior diagnosis of COPD (N = 1987) n (%) |
p-value* |
|---|---|---|---|---|
| COPD by Spirometry: | < 0.001 | |||
| Definite/Probable | 1136 (45.2) | 303 (57.5) | 833 (41.9) | |
| Uncertain | 107 (4.3) | 54 (10.3) | 53 (2.7) | |
| None | 1271 (50.6) | 170 (32.2) | 1101 (55.4) | |
| Severity of Spirometry Diagnosis COPD (among definite/probable) | < 0.001 | |||
| Stage I (Mild) | 456 (40.1) | 71 (23.4) | 385 (46.2) | |
| Stage II (Moderate) | 583 (51.3) | 173 (57.1) | 410 (49.2) | |
| Stage III (Severe) | 87 (7.7) | 51 (16.8) | 36 (4.3) | |
| Stage IV (Very Severe) | 10 (0.9) | 8 (2.6) | 2 (0.2) |
*Comparison of prior diagnosis of COPD to no prior diagnosis of COPD by chi-square