Table 2. Sample size, the distribution of A-6G genotypes and allele frequencies, and P-values of HWE.

	Sample size		AA(genotype)		AG(genotype)		GG(genotype)		A allele frequency (%)		HWE(P* value)
First author	Cases	Controls	Cases	Controls	Cases	Controls	Cases	Controls	Cases	Controls	Controls
Ge [16]	96	112	36	49	50	55	10	8	63.54	68.30	0.1558
Hu [14]	107	108	53	59	35	37	19	12	65.89	71.76	0.1078
Jiang [17]	220	235	136	169	74	62	10	4	78.64	85.11	0.5325
Kong [15]	324	187	200	104	112	77	12	6	79.01	76.20	0.0641
Liu(Han) [38]	97	90	65	59	27	27	5	4	80.93	80.56	0.6878
Liu(Tibetan) [12]	163	213	64	102	86	97	13	14	65.64	70.66	0.2927
Liu(Yi) [12]	63	82	47	52	15	27	1	3	86.51	79.88	0.8259
Qi [7]	1122	965	671	608	378	313	73	44	76.65	79.22	0.6470
Wang(Amis) [9]	107	96	89	65	17	30	1	1	91.12	83.33	0.2207
Wang(Kazakh) [18]	201	151	77	52	81	71	43	28	58.46	57.95	0.6550
Wang(Li) [11]	100	100	83	89	15	10	2	1	90.50	94.00	0.2565
Wu [10]	459	325	316	229	121	90	22	6	82.03	84.31	0.4010
Yao [19]	67	54	33	30	31	21	3	3	73.49	75.00	0.7855
Ying [20]	243	258	138	161	86	83	19	14	74.49	78.49	0.4473
Yue [21]	73	82	3	1	19	27	51	54	80.77	82.32	0.2354

Abbreviations: HWE, Hardy–Weinberg equilibrium.

*The P-value of HWE determined by the χ² test.