Table 4.

Characteristics of the studies included in the meta-analysis

Author	Country	Ethnicity	Case/control	Case			Control
				TT	TC	CC	TT	TC	CC
Study1#1	China	Han	432/864	373	54	5	793	69	2
Study2#2	China	Han	167/278	136	29	2	252	25	1
Jabandziev 2014*	Czech	NA	114/529	85	29		432	97
Hubacek 2001	Germany	NA	204/250	157	42	5	212	38	0

Zeng’s Chongqing and Zhejiang cohorts were included in our study, so they were not presented independently

^#1Study1 represented the Southwest cohorts in our study

^#2Study2 represented Southeast cohorts in our study

*Jabandziev’s study just provided genotype number for TT vs. TT + TC. The number of TT and CC was not shown separately. 29 and 97 represented the TT + TC in case and control, respectively