Table 2.
Spatial Clusters of Predicted COPD Prevalence Among Chinese Adults Aged 40 to 59 Without a History of Smoking in 2015
| Cluster No., Location | Radius, (km) | Population Aged 40–59 Years (100,000) | No. of COPD Cases (100,000) | RR | 95% CI | P value | |
|---|---|---|---|---|---|---|---|
| Expected | Observed | ||||||
| 1, Sichuan, Gansu, Qinghai, Ningxia, Southwest of Shaanxi, and east of Tibet | 840.5 | 557.6 | 30.3 | 47.0 | 1.65 | 1.63–1.67 | <0.0001 |
| 2, Liaoning, northeast of Inner Mongolia, southwest of Jilin, east of Beijing, Tianjin, and northeast of Shandong | 499.2 | 546.7 | 29.7 | 42.2 | 1.49 | 1.47–1.51 | <0.0001 |
| 3, Northeast of Tianjin, east of Hebei, south of Liaoning, middle and east of Shandong, and northeast of Jiangsu | 481.8 | 649.5 | 35.2 | 43.7 | 1.28 | 1.26–1.30 | <0.0001 |
| 4, Southeast of Inner Mongolia, Shanxi, west and middle of Hebei, west of Beijing and Tianjin, and northeast of Shaanxi | 381.4 | 504.5 | 27.4 | 32.8 | 1.22 | 1.20–1.24 | <0.0001 |
| 5, Middle of Shandong | 95.3 | 72.3 | 3.9 | 4.7 | 1.20 | 1.14–1.26 | <0.0001 |
| 6, Southeast of Chongqing, middle and northeast of Guizhou, and west of Hunan | 246.1 | 275.9 | 15.0 | 16.3 | 1.09 | 1.06–1.12 | <0.0001 |
| 7, East of Shaanxi, south of Shanxi, west of Henan | 191.3 | 132.5 | 7.2 | 8.1 | 1.13 | 1.09–1.17 | <0.0001 |