Table 2. Characteristics of the included case-control studies in the meta-analysis of the association between GSTP1 polymorphism and the risk of renal cell carcinoma.

First author	Year	Country	Ethnicity	Source of	HWE	Quality	Sample size		Case						Control
[reference]				controls		Score	Case	Control	A	G	AA	AG	GG	AG+GG	A	G	AA	AG	GG	AG+GG
Ahmad [24]	2012	India	Asian	Population-based	NS	11	196	250	241	151	71	99	26	125	355	145	126	103	21	124
Wiesenhütter [23]	2007	Germany	Caucasian	Hospital-based	NS	8	99	325	141	57	49	43	7	50	412	238	134	144	47	191
Sweeney [30]	2000	USA	Mixed	Population-based	NS	9	130	491	172	88	58	56	16	72	642	340	213	216	62	278
Longuemaux [31]	1999	France	Caucasian	Hospital-based	NS	8	160	189	209	111	71	67	22	89	261	117	93	75	21	96
Wang [32]	2011	China	Asian	Hospital-based	NS	9	207	236	341	73	143	55	9	64	400	72	173	54	9	63

Abbreviations: HWE, Hardy-Weinberg Equilibrium; NS, not significant.