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. 2011 Jul 22;11:586. doi: 10.1186/1471-2458-11-586

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