Table 1.

The characteristics of included studies.

Authors	Publication year	Country	Number of Subjects		NR			R			NR		R
			NR	R	CC	CT	TT	CC	CT	TT	C	T	C	T
Alpman et al.	2010	Turkey	39	92	6	20	12	26	37	24	32	44	89	85
Haerian et al.	2011	Asian	323	362	109	158	56	110	180	72	376	270	400	324
Szoeke et al.	2009a	Australia	64	148	21	27	16	34	67	47	69	59	135	161
Szoeke et al.	2009b	Scotland	133	152	20	69	44	34	72	46	109	157	140	164
Szoeke et al.	2009c	China	11	34	1	8	2	13	20	1	10	12	46	22
Tan et al.	2004	Australia	401	208	75	193	133	37	115	56	343	459	189	227
Chen L et al.	2007	China	50	164	15	25	10	63	79	22	55	45	205	123
Di Q et al.	2011	China	91	79	44	37	10	32	30	17	125	57	94	64
Dong et al.	2011	China	157	193	64	75	18	82	83	28	203	111	247	139
Hung et al.	2007	China	114	213	40	55	19	39	107	67	135	93	185	241
Kwan et al.	2007	China	221	297	80	104	37	114	161	22	264	178	389	205
Ufer et al.	2009	Germany	188	103	44	85	59	20	46	37	173	203	86	120
Grover et al.	2010	India	87	125	13	44	30	14	55	56	70	104	83	167
Kumaril et al.	2011	India	125	260	12	67	46	42	120	98	91	159	204	316
Takhan et al.	2009	India	94	231	9	52	33	38	104	89	70	118	180	282
Vahab et al.	2009	India	113	54	3	61	49	3	8	43	67	159	14	94
Sayyah et al.	2011	Iran	132	200	34	55	43	32	80	88	123	141	144	256
Shahwan et al.	2007	Ireland	122	233	20	64	38	37	119	77	104	140	193	273
Seo et al.	2006	Japan	126	84	34	58	34	36	34	14	126	126	106	62
Kim et al.	2009	Korea	198	193	73	97	28	81	90	22	243	153	252	134
Emich-Widera et al.	2013	Poland	60	25	9	33	18	1	16	8	51	69	18	32
Emich-Widera et al.	2014	Poland	193	135	19	114	60	21	82	32	152	234	124	146
Sills et al.	2005	Scotland	230	170	41	112	77	32	82	56	194	266	146	194
Sanchez et al.	2010	Spain	111	178	40	49	22	52	81	45	129	93	185	171
Dericiogl et al.	2008	Turkey	89	100	26	34	29	25	49	26	86	92	99	101
Ozgon et al.	2008	Turkey	44	53	13	26	5	16	29	8	52	36	61	45
Saygi et al.	2014	Turkey	59	60	19	26	14	12	30	18	64	54	54	66
Seven et al.	2014	Turkey	69	83	17	30	22	22	38	23	64	74	82	84
Siddiqui et al.	2003	UK	200	115	55	106	39	18	63	34	216	184	99	131
Soranzo et al.	2004	UK	280	136	73	145	62	20	80	36	291	269	120	152

NR – anti-epileptic drug no response (case group); R – effective group (control group). a, b, and c represent independent studies from the same article.