Table 3.

Results of meta-analysis for XPD Asp312Asn (G312A) polymorphism and breast cancer risk

Comparison	Population	N	Test of association			Model	Test of heterogeneity
			OR	95 % CI	P		P	I 2
A vs. G	Overall	12	1.06	0.95–1.18	0.325	R	0	88.5
	Others	6	1.08	0.93–1.25	0.341	R	0	85.3
	Caucasians	6	1.04	0.89–1.21	0.645	R	0	89.0
AA vs. GG	Overall	12	1.06	0.87–1.29	0.591	R	0	77.3
	Others	6	1.03	0.78–1.37	0.820	R	0	70.0
	Caucasians	6	1.09	0.80–1.47	0.584	R	0	82.2
GA vs. GG	Overall	12	1.07	0.96–1.20	0.223	R	0	85.7
	Others	6	1.16	0.99–1.36	0.067	R	0	82.0
	Caucasians	6	0.99	0.88–1.13	0.836	R	0	82.2
AA vs. GA / GG	Overall	12	1.04	0.87–1.24	0.654	R	0.001	66.5
	Others	6	0.97	0.75–1.26	0.821	R	0.025	61.0
	Caucasians	6	1.12	0.85–1.49	0.423	R	0.001	74.6
AA / GA vs. GG	Overall	12	1.06	0.96–1.16	0.273	R	0	87.9
	Others	6	1.11	0.97–1.28	0.142	R	0	84.6
	Caucasians	6	1.00	0.89–1.14	0.962	R	0	87.1

OR odds ratio, CI confidence interval, F fixed effects model, R random effects model