Prevalence of fluorosis in five geographic areas in China
| FNB areas | FSB areas | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Areas | Provinces (n) | Villages (n) | Dental fluorosis | Clinical skeletal fluorosis | Villages (n) | Dental fluorosis | Clinical skeletal fluorosis | ||||||||||||
| Villages (n) | Subjects (n) | Patients (n) | Prevalence rate (%) | Village (n) | Subjects (n) | Patients (n) | Prevalence rate (%) | Villages (n) | Subjects (n) | Patients (n) | Prevalence rate (%)* | Villages (n) | Subjects (n) | Patients (n) | Prevalence rate (%)* | ||||
| Northeast | 3 | 110 | 108 | 2938 | 1137 | 38.70 | 94 | 20374 | 2356 | 11.56 | 59 | 59 | 2231 | 320 | 14.34 | 59 | 17858 | 1000 | 5.60 |
| Northwest | 6 | 421 | 337 | 11343 | 5064 | 44.64 | 284 | 64732 | 12166 | 18.79 | 187 | 186 | 10948 | 1451 | 13.25 | 90 | 29867 | 3064 | 10.26 |
| Central | 8 | 838 | 838 | 38326 | 20069 | 52.36 | 743 | 312922 | 28155 | 9.00 | 190 | 182 | 9982 | 2945 | 29.50 | 183 | 107998 | 4309 | 3.99 |
| Southwest | 3 | 16 | 16 | 1377 | 1080 | 78.43 | 15 | 5544 | 970 | 17.50 | 17 | 12 | 785 | 205 | 26.11 | 17 | 3928 | 96 | 2.44 |
| South | 7 | 19 | 19 | 871 | 319 | 36.62 | 16 | 2726 | 293 | 10.75 | 128 | 119 | 2985 | 200 | 6.70 | 121 | 28749 | 613 | 2.13 |
| Total | 27 | 1404 | 1318 | 54855 | 27669 | 50.44 | 1152 | 406298 | 43940 | 10.81 | 581 | 558 | 26931 | 5121 | 19.02 | 470 | 188400 | 9082 | 4.82 |
Northeast: Heilongjiang, Jilin and Liaoning; Northwest: Inner Mongolia, Xinjiang, Qinghai, Ningxia, Gansu and Shaanxi; Central: Beijing, Tianjin, Hebei, Shanxi, Shandong, Henan, Jiangsu and Anhui; Southwest: Sichuan, Chongqing and Yunnan; South: Hubei, Zhejiang, Hunan, Jiangxi, Fujian, Guangxi and Guangdong.
*All p values in the comparison of dental fluorosis or clinical skeletal fluorosis between FNB and FSB areas were <0.001.