Table 2.
Prevalence of physician-diagnosed COPD by geographic areas in China
| Urban | Rural | Total | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Subjects | COPD | Prevalence (95%CI) | Subjects | COPD | Prevalence (95%CI) | Subjects | COPD | Prevalence (95%CI) | P value* | |
| West | 4290 | 135 | 3.1 (2.6-3.6) | 12894 | 509 | 3.9 (3.6-4.2) | 17184 | 644 | 3.7 (3.4-4.0) | 0.019 |
| Central | 6840 | 200 | 2.9 (2.5-3.3) | 8587 | 211 | 2.5 (2.2-2.8) | 15427 | 411 | 2.7 (2.4-3.0) | 0.078 |
| East | 8198 | 149 | 1.8 (1.5-2.1) | 8554 | 219 | 2.6 (2.3-2.9) | 16752 | 368 | 2.2 (2.0-2.4) | 0.001 |
| Total | 19328 | 484 | 2.5 (2.3-2.7) | 30035 | 939 | 3.1 (2.9-3.3) | 49363 | 1423 | 2.9 (2.8-3.1) | < 0.001 |
*Comparison between urban and rural with COPD prevalence