Table 2. Distribution of P2X7 A1513C gene polymorphism studies included in this meta-analysis.

Authors, Year of Publication and Reference No.	Ethnicity	Controls				Cases				HWE
		Genotype			Minor Allele	Genotype			Minor Allele
		AA	AC	CC		AA	AC	CC
Fernando et al. 2007 [18]	Asian	105	55	7	0.20	9	17	4	0.41	0.950
Fernando et al. 2007 [18]	Caucasian	64	34	4	0.20	18	28	4	0.36	0.840
Xiao et al. 2009 [19]	Asian	221	119	44	0.26	30	19	6	0.28	0.001
Taype et al. 2010 [20]	Caucasian	347	149	17	0.17	82	37	2	0.16	0.830
Tekin et al. 2010 [21]	Caucasian	141	46	5	0.14	39	28	7	0.28	0.590
Sharma et al. 2010 [22]	Asian	126	48	3	0.15	8	13	2	0.36	0.510
Ben-Selma et al. 2011 [23]	Caucasian	104	40	6	0.17	19	23	13	0.44	0.340
Singla et al. 2012 [24]	Asian	258	123	11	0.18	45	22	1	0.17	0.410
Ozdemir et al. 2014 [25]	Caucasian	76	63	21	0.32	47	34	8	0.28	0.170

HWE: Hardy-Weinberg equilibrium.