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. 2014 Apr 3;9(4):e93631. doi: 10.1371/journal.pone.0093631

Table 1. A summary of sampling information.

Sampling place Individual ratio (n/n)
Ethnic group Province Urban Rural Sample size (n) Female/Male Urban/Rural
Han Heilongjiang Nangang, Daoli and Daowai District of Harbin Mulan and Tonghe County of Harbin 30 13/17 16/14
Han Henan Jinshui and Zhongyuan District of Zhengzhou Dengfeng County of Zhengzhou 23 9/14 11/12
Han Jiangsu Chongan District of Wuxi Binghu District of Wuxi 21 13/8 12/9
Han Sichuan Wuhou District of Chengdu Dayi and Pujiang County of Chengdu 17 12/5 8/9
Zhuang Guangxi Xingning and Xixiangtang District of Nanning Lingyun County of Baise 46 22/24 22/24
Uygur Xinjiang Shuimogou and Tianshan District of Urumqi Altay County, Altay 21 10/11 12/9
Kazakh Xinjiang Shuimogou and Tianshan District of Urumqi Yining and Tacheng County of Yili 22 13/9 13/9
Mongolian Inner Mongolia Saihan District of Hohhot Bordered Yellow and Bordered White Banner of Xilinguole 48 25/23 22/26
Tibetan Tibetan Chengguan District of Lhasa Nagqu County of Nagqu 43 21/22 15/28
Bai Yunnan Panlong and Xishan District of Kunming Eryuan and Jianchuan County of Dali 43 19/24 14/29
Total 314 157/157 145/169