Table 1.

Characteristics of studies included in the meta-analysis.

Author	Year	Region	Total	Case GG	Case GC	Case CC	Total	Con GG	Con GC	Con CC	H-W (P)
IL-18 − 607C/A polymorphism
Muhammad Imran et al.	2014	Pakistan	260	87	113	60	120	32	53	35	0.203
N. Bouzgarrou et al.	2008	Tunisian	82	21	44	17	81	24	38	19	0.601
Stephan L et al.	2009	Germany	757	276	347	134	791	300	369	122	0.628
Mohamed Mandour et al.	2014	Egypt	123	20	63	40	123	26	58	39	0.608
IL-18 − 137G/C polymorphism
Muhammad Imran et al.	2014	Pakistan	120	43	61	16	115	48	57	10	0.226
N. Bouzgarrou et al.	2008	Tunisian	82	35	35	12	81	38	31	12	0.187
Stephan L et al.	2009	Germany	757	386	315	56	791	439	299	53	0.829