Table 1.

Characteristics of the studies included in this meta-analysis.

	Year	Ethnicity	Case	Control	Case			Control			HWE
Study					4G/4G	4G/5G	5G/5G	4G/4G	4G/5G	5G/5G
Wolf	2003	Caucasian	49	102	17	25	7	32	50	20	Yes
Buchholz	2003	Caucasian	184	127	72	75	37	41	58	28	Yes
Dossenbach-Glaninger	2003	Caucasian	49	48	12	28	9	8	25	16	Yes
Guan	2005	Asian	127	117	58	52	17	20	59	38	Yes
Coulam	2006	Caucasian	150	20	11	117	22	2	13	5	Yes
Coulam	2008	Caucasian	550	41	39	396	115	6	22	13	Yes
Goodman	2009	Caucasian	120	84	38	57	25	23	48	13	Yes
Al Sallout	2010	Caucasian	100	100	16	44	40	16	48	36	Yes
Ivanov	2010	Caucasian	110	97	46	44	20	26	45	26	Yes
Ivanov	2011	Caucasian	52	125	14	23	15	26	45	26	Yes
Aarabi	2011	Caucasian	63	114	19	30	14	25	47	22	Yes
Jeddi-Tehrani	2011	Caucasian	100	100	9	31	60	1	27	72	Yes
Idali	2012	Caucasian	106	100	17	53	35	1	27	72	Yes
Torabi	2012	Caucasian	100	100	9	31	60	1	27	72	Yes
Ozdemir	2012	Caucasian	543	327	121	331	91	10	62	34	No
Parveen	2013	Asian	200	300	45	100	55	74	131	95	No
Magdoud	2013	Caucasian	304	371	37	128	139	10	104	257	Yes
Subrt	2013	Caucasian	157	74	59	75	23	10	54	10	No
Jeon	2014	Asian	308	227	129	132	47	71	117	39	Yes
Khosravi	2014	Caucasian	595	100	122	288	184	1	27	72	Yes
Kim	2014	Asian	227	304	73	123	31	102	154	48	Yes
Lino	2014	Caucasian	112	98	12	57	37	16	40	42	Yes

HWE – Hardy-Weinberg equilibrium.