Table 2. Study characteristics in the meta-analysis.

First author	Publication year	Country	Ethnicity	Sample size (cases/controls)	MAFb	Quality scores	P a
Yamada	1997	Japan	Asian	159/122	0.197	6	0.119
Tiret	2000	France	European	428/398	0.426	7	0.969
Tiago	2002	Africa	African	157/225	0.129	6	0.026
Goldbergova	2003	Czech Republic	European	158/200	0.435	8	0.808
Peng	2006	China	Asian	111/110	0.223	7	0.176
Zakrzewski-Jakubiak	2007	Canada	European	58/111	0.316	6	0.649
Wu	2009	China	Asian	210/210	0.138	9	0.998

^aP value of Hardy-Weinberg equilibrium test.

^bMAF, minor allele frequency in controls.