Table 1.

Characteristics of studies included in the meta-analysis

Study (year)	Disease	Design	Case number	Control number	Ethnicity
Chumakov et al. (a) (2002)	schizophrenia	Case-control	213	241	European
Chumakov et al. (b) (2002)	schizophrenia	Case-control	183	183	European
Korostishevsky et al. (2004)	schizophrenia	Case-control	60	130	European
Schumacher et al. (a) (2004)	schizophrenia	Case-control	299	300	European
Wang et al. (2004)	schizophrenia	Case-control	537	538	Asian
Ma et al. (a) (2006)	schizophrenia	Case-control	588	588	Asian
Ma et al. (b) (2006)	schizophrenia	Case-control	183	182	European
Wood et al. (2006)	schizophrenia	Case-control	311	291	European
Williams et al. (a) (2006)	schizophrenia	Case-control	709	1416	European
Bakker et al. (2007)	schizophrenia	Case-control	273	580	European
Vilella et al. (2007)	schizophrenia	Case-control	589	615	European
Yue et al. (a) (2007)	schizophrenia	Case-control	359	359	Asian
Addington et al. (2004)	schizophrenia	Family-based	98 families		Mixed
Mulle et al. (2005)	schizophrenia	Family-based	159 families		Mixed
Zou et al. (2005)	schizophrenia	Family-based	233 families		Asian
Korostishevsky et al. (2006)	schizophrenia	Family-based	223 families		European
Hong et al. (2006)	schizophrenia	Family-based	216 families		Asian
Liu et al. (2006)	schizophrenia	Family-based	218 families		Asian
Yue et al. (b) (2007)	schizophrenia	Family-based	237 families		Asian
Chen et al. (2004)	bipolar disorder	Case-control	139	113	European
Schumacher et al. (b) (2004)	bipolar disorder	Case-control	300	300	European
Williams et al. (b) (2006)	bipolar disorder	Case-control	706	1416	European
Hattori et al. (2003)a	bipolar disorder	Family-based	174 families		European

^aThe data from two family sample sets (Hattori et al) were combined for convenient to statistical analysis.