Table 1.

Characteristics of eligible studies

First author	Year	Country	Ethnicity	Total sample size (case/control)	Genotyping method	Source of control	Study	Polymorphisms	P for HWE
Gilbert [18]	2015	UK	Caucasian	951/898	Taqman	PB	NCC	Cdx2	0.96
				950/890	Taqman	PB	NCC	ApaI	0.09
Jingwi [19]	2015	USA	African American	446/379	TaqMan	PB	CC	Apa1	0.89
Yousaf [43]	2014	Pakistan	Asian	47/134	PCR-RFLP	PB	CC	Apa1	<0.0001
Jin Oh [41]	2014	Korean	Asian	272/173	PCR-RFLP	HB	CC	Cdx2	─
Rowland (A) [56]	2012	USA	African American	414/223	TaqMan	PB	CC	Cdx-2	0.07
			Caucasian	1117/795	TaqMan	PB	CC	Cdx-2	0.55
Bai [73]	2009	China	Asian	122/130	PCR-RFLP	HB	CC	ApaI	0.21
Onen [28]	2008	Turkey	Caucasian	133/157	PCR-RFLP	HB	CC	Apa1	0.41
Torkko [27]	2008	USA	Hispanic White	141/273	TaqMan	PB	CC	Cdx-2	0.05
			Caucasian	444/488	TaqMan	PB	CC	Cdx-2	0.99
Mikhak [26]	2007	USA	Caucasian	688/689	TaqMan	PB	CC	Cdx-2	0.15
Chaimuangraj [74]	2006	Thailand	Asian	28/74	PCR-RFLP	HB	CC	Apa1	0.88
Cicek [23]	2006	USA	Caucasian	439/479	TaqMan	PB	CC	Cdx2	0.26
				439/478	TaqMan	PB	CC	Apa1	0.25
John [24]	2005	USA	Caucasian	417/435	TaqMan	PB	CC	Cdx-2	0.75
Huang [15]	2004	Taiwan	Asian	160/205	PCR-RFLP	HB	CC	Apa1	0.03
Oakley-Girvan [25]	2004	USA	African American	113/121	PCR-RFLP	PB	CC	Apa1	0.16
			Caucasian	232/171	PCR-RFLP	PB	CC	Apa1	0.19
Maistro [42]	2004	Brazil	mixed	165/200	PCR-RFLP	PB	CC	Apa1	─
Bodiwala [22]	2004	UK	Caucasian	368/243	PCR-RFLP	HB	CC	Cdx-2	0.21
Suzuki [16]	2003	Japan	Asian	81/105	PCR-RFLP	PB	CC	Apa1	0.007
Habuchi [21]	2000	Japan	Asian	222/337	PCR-RFLP	HB	CC	Apa1	0.96