Table 1.

The characteristics of included studies

Authors	Publication year	Country	NR			R			NR	R
			CC	CT	TT	CC	CT	TT	C	T
Chen L et al.	2007	China	15	25	10	63	79	22	50	164
Dericiogl et al.	2008	Turkey	26	34	29	25	49	26	89	100
Di Q et al.	2011	China	44	37	10	32	30	17	91	79
Dong et al.	2011	China	64	75	18	82	83	28	157	193
Grover et al.	2010	India	13	44	30	14	55	56	87	125
Haerian et al.	2011	Asian	109	158	56	110	180	72	323	362
Hung et al.	2007	China	40	55	19	39	107	67	114	213
Kim et al.	2009	Korea	73	97	28	81	90	22	198	193
Kumaril et al.	2011	India	12	67	46	42	120	98	125	260
Kwan et al.	2007	China	80	104	37	114	161	22	221	297
Ozgon et al.	2008	Turkey	13	26	5	16	29	8	44	53
Sanchez et al.	2010	Spain	40	49	22	52	81	45	111	178
Sayyah et al.	2011	Iran	34	55	43	32	80	88	132	200
Seo et al.	2006	Japan	34	58	34	36	34	14	126	84
Shahwan et al.	2007	Ireland	20	64	38	37	119	77	122	233
Siddiqui et al.	2003	UK	55	106	39	18	63	34	200	115
Sills et al.	2005	Scotland	41	112	77	32	82	56	230	170
Soranzo et al.	2004	UK	73	145	62	20	80	36	280	136
Szoeke et al.	2009	Australia	21	27	16	34	67	47	64	148
Szoeke et al.	2009	Hong Kong	1	8	2	13	20	1	11	34
Szoeke et al.	2009	Scotland	20	69	44	34	72	46	133	152
takhan et al.	2009	India	9	52	33	38	104	89	94	231
Tan et al.	2004	Australia	75	193	133	37	115	56	401	208
Ufer et al.	2009	Germany	44	85	59	20	46	37	188	103
Vahab et al.	2009	India	3	61	49	3	8	43	113	54

Note: NR: Anti-epileptic drug no response (Case group); R: effective group (Control group).