Table 2. The prevalence of CE in different province.

Provinces and regions	The no. of patients	The no. of population	Prevalence (%)	χ2	P
Xinjiang Uygur Autonomous Region	14	1365	1.03
Tibet Autonomous Region	25	996	2.51	11.53	0.020
Gansu Province	11	1123	0.98
Sichuan Province	21	1258	1.67
Qinghai Province	19	1072	1.77
Total	90	5813	1.55