Table 1.

Demographic characteristics of studies included in meta-analysis

Study	N	Males/Females	Ethnicity	Mean Age (case/control)
Aznar et al. 2004	343	105/238	Caucasian	<50
Biswas et al. 2009	240	NP	Asian	<40
de Paula Sabino et al. 2006	308	72/256	Caucasian	31/34
De Stefano et al. 1998	270	113/157	Caucasian	34/49
Grossman et al. 2002	279	138/141	Caucasian	36/33 (median)
Lopaciuk et al. 2001	338	207/131	Caucasian	38/33
Madonna et al. 2002	394	183/211	Caucasian	38/36
Margaglione et al. 1999	1238	545/693	Caucasian	39 (median, cases)
Martinelli et al. 2006	398	0/398	Caucasian	34/34
D'Amico et al. 1998	155	60/95	Caucasian	34/33
Longstreth et al. 1998	429	0/429	Caucasian / African-American	37/38
Nabavi et al. 1998	425	NP	Caucasian	35/<45
Pezzini et al. 2005	321	169/152	Caucasian	35/35
Pongracz et al. 2006	451	NP	Caucasian	<50/<49
Rubattu et al. 2005	295	149/146	Caucasian	<45
Slooter et al. 2005	960	0/906	Caucasian	39/40
Voetsch et al. 2000	378	161/217	Caucasian	<45
Landi et al. 1996	285	NP	Caucasian	33/<45

NP = not provided