Table 2. ALDH2 (rs671) polymorphisms genotype distribution and allele frequency in cases and controls.

First author	Year	Genotype(N)												MAF	HWE
		Case				Control				Case		Control
		Total	GG	GA	AA	Total	GG	GA	AA	G	A	G	A
Zhao et al. [18]	2014	308	194	106	8	308	194	100	14	494	122	488	128	0.21	0.81
Li et al. [19]	2009	192	101	76	15	191	114	66	11	278	106	294	88	0.48	0.72
Zhou et al. [15]	2010	201	99	91	11	199	97	91	11	289	113	285	113	0.28	0.08
Yuan et al. [20]	2016	161	104	50	7	161	99	60	2	258	64	258	64	0.19	0.03
Hidaka et al. [21]	2015	457	287	149	21	457	292	150	15	723	191	734	180	0.20	0.42
Yang et al. [22]	2016	450	304	141	5	1050	736	292	22	749	151	1764	336	0.23	0.26
Cao et al. [23]	2010	382	196	161	25	382	206	155	21	553	211	567	197	0.26	0.24
Chen et al. [24]	2016	246	133	95	18	274	163	101	10	361	131	427	121	0.22	0.24
Zhang et al. [25]	2017	2686	1995	643	48	3675	2663	941	71	4633	739	6267	1083	0.15	0.25
Matsuo et al. [10]	2013	696	310	323	63	1372	683	580	109	943	449	1946	798	0.29	0.36
Chang et al. [26]	2014	196	108	76	12	393	213	160	20	292	100	586	200	0.25	0.15
Shin et al. [9]	2011	445	291	141	13	370	250	102	18	723	167	602	138	0.19	0.08

MAF: minor allele frequency; HWE: Hardy-Weinberg equilibrium.