Table 2. HLA-G 14–bp Ins/Del polymorphism genotype distribution and allele frequency in cases and controls.

First author	Year	Genotype (n)								Allele frequency (n)				HWE
		Case				Control				Case		Control
		Total	Del/Del	Ins/Del	Ins/Ins	Total	Del/Del	Ins/Del	Ins/Ins	Del	Ins	Del	Ins
Gao et al. [21]	2011	132	54	66	12	254	77	128	46	174	90	282	220	0.852
Xu et al. [35]	2017	113	52	44	17	150	51	75	24	148	78	177	123	0.919
Zidi et al. [36]	2016	104	31	52	20	83	20	42	20	114	92	82	82	0.975
Zambra et al. [37]	2016	187	85	83	19	129	45	58	26	253	121	148	110	0.656
Yang et al. [22]	2014	315	169	110	36	400	188	176	36	448	182	552	248	0.850
Silva et al. [38]	2013	55	11	29	15	50	19	19	12	51	59	57	43	0.283
Agnihotri et al. [39]	2017	383	82	212	89	383	122	175	86	376	390	419	347	0.876
Wisniewski et al. [40]	2015	319	111	160	48	465	157	231	77	382	256	545	385	0.311
Teixeira et al. [41]	2013	109	49	44	16	202	70	87	45	142	76	227	177	0.205
Haghi et al. [42]	2015	227	56	127	44	255	52	154	49	239	215	258	252	0.004
Garziera et al. [43]	2016	308	97	138	73	294	114	122	58	332	284	350	238	0.059
Chen et al. [44]	2012	239	86	123	30	467	155	237	70	295	183	547	377	0.412
Tawfeek et al. [45]	2018	150	40	102	8	100	18	44	38	182	118	80	120	0.707
Dardano et al. [23]	2012	183	47	96	40	245	84	110	51	190	176	278	212	0.409
Ramos et al. [11]	2014	80	18	54	8	191	57	98	36	90	70	212	170	0.867
Eskandari-Nasab et al. [46]	2013	236	80	106	50	203	49	91	63	266	206	189	217	0.368
Lau et al. [24]	2011	153	66	58	29	404	146	194	64	190	116	486	322	0.973
Kim et al. [47]	2013	270	159	93	18	91	61	28	2	411	129	150	32	0.841
Jiang et al. [13]	2011	318	187	113	18	599	304	241	54	487	149	849	349	0.822
Jeong et al. [48]	2014	80	54	21	5	80	44	32	4	129	31	120	40	0.837
Ferguson et al. [49]	2012	539	184	242	113	833	272	399	162	610	468	943	723	0.770
Bortolotti et al. [50]	2014	100	49	40	11	100	38	40	22	138	62	116	84	0.201
Castelli et al. [20]	2008	80	28	37	15	107	35	50	22	93	67	120	94	0.868
Bielska et al. [51]	2015	207	49	91	67	150	33	89	28	189	225	155	145	0.071
de Figueiredo-Feitosa et al. [52]	2017	94	34	47	13	156	61	65	30	115	73	187	125	0.255