Table 2.

Stratified meta-analysis of effect of 3′VNTR on risk for PD.

Subgroup (n of studies included)	Allele 9 vs. others						Allele 10 vs. others
	Odds ratio	95% CI	Significance test		Test for heterogeneity		Odds ratio	95% CI	Significance test		Test for heterogeneity
			z	p	Q	p			z	p	Q	p
Caucasian (7)	1.07	0.93, 1.23	0.953	0.34	7.012	0.32	0.92	0.81, 1.04	−1.337	0.181	5.347	0.500
Asian (7)	1.14	0.87, 1.48	0.947	0.344	7.131	0.309	0.78	0.65, 0.94	−2.615	0.009	2.998	0.809
All (18)	1.1	1.00, 1.22	1.885	0.059	17.513	0.309	0.91	0.82, 1.01	−1.738	0.082	21.937	0.187

All: all studies involved.