Glutathione S-transferase pi 1 variant and squamous cell carcinoma susceptibility: a meta-analysis of 52 case-control studies

Table 2 Meta-analysis of the GSTP1 rs1695 A/G polymorphism

Statistical analysis	Index	Allele	Carrier	Homozygote	Heterozygote	Dominant	Recessive
Association	OR	0.99	0.99	1.02	0.96	0.97	1.03
	95% CIs	0.95~1.03	0.94~1.03	0.93~1.12	0.91~1.02	0.92~1.03	0.94~1.12
	P _a	0.601	0.587	0.689	0.167	0.289	0.548
Sample size	case	9763	9763	9763	9763	9763	9763
	control	15,028	15,028	15,028	15,028	15,028	15,028
	study	52	52	52	52	52	52
Heterogeneity	I²	15.5%	0.0%	9.7%	7.7%	11.8%	1.2%
	P _h	0.174	0.999	0.278	0.318	0.239	0.450
	Model	Fixed	Fixed	Fixed	Fixed	Fixed	Fixed
Egger’s test	t	1.14	1.38	0.13	2.36	2.16	−0.31
	P _E	0.259	0.175	0.899	0.022	0.036	0.760
Begg’s test	z	0.53	0.84	0.77	1.96	1.82	1.29
	P _B	0.597	0.398	0.444	0.049	0.068	0.198

OR odds ratio, CIs confidence intervals, P_a, P value of association test, P_h, P value of heterogeneity test, P_E, P value of Egger’s test, P_B, P value of Begg’s test

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