Region | No. tested | Prevalence (%) | Time tested (year) | Reference |
---|
Gansu | 124 | 17.7 | 1997-1998 | [18] |
Ningxia | 380 | 28.4 | 2007 | [16] |
Hebei | 13 | 23.1 | 1997-1998 | [18] |
Henan | 35 | 25.7 | 1997-1998 | [18] |
Qinghai | 321 | 5.90 | 2009 | [17] |
Shandong | 62 | 16.1 | 1997-1998 | [18] |
Shanxi | 132 | 43.2 | 1997-1998 | [18] |
Sichuan | 39 | 25.6 | 1997-1998 | [18] |