. Author manuscript; available in PMC: 2014 Mar 22.

Published in final edited form as: Clin Gastroenterol Hepatol. 2008 Apr;6(4):451–458. doi: 10.1016/j.cgh.2008.02.011

Table 1.

Characteristics of Case-Control Studies Included in the Pooled Analysis

			Cases (n = 4784)

Acronym	Country: Study center	Year	Age, y	n	Participation %
Connecticut	United States: Connecticut	1995–2001	23–85	463	72
North-South Italy^a	Italy: Aviano, Naples	1999–2002	18–84	225	>97
NCI-SEER	United States: Detroit, MI; Iowa; Los Angeles, CA; Seattle, WA	1998–2001	20–74	813	76
NSW	Australia: New south Wales; Australian Capital Territory	2000–2002	20–74	587	85
UCSF	United States: San Francisco, CA	1988–1995	21–74	554	72
EpiLymph	Europe: Spain,^a France,^a Germany, Italy, Ireland,^a and Czech Republic^a	1998–2004	18–89	1346	82–93
British Columbia	Canada: Greater Vancouver Regional District, Capital Regional District	1996–2004	20–82	796	85

Controls (n = 6269)

Matching criteria	Source	n	Participation %	Study Reference
Age	RDD and CMMS	534	RDD, 69; CMMS, 47	11
None	Hospital controls	504	>91	13
Age, sex, and study site	RDD and CMMS	684	52	10
Age, sex, and area of residence	Random selection from electoral rolls	518	61	14
Age, sex, and country of residence	RDD	1544	78
Age and sex and hospital study site when appropriate	Hospital-based (Spain, France, Ireland, and Czech Republic); population-based controls (Germany and Italy)	1788	44–96	12
Age, sex, and geographic region	Client Registry of the Ministry of Health	697	50

RDD, random digit dialing; CMMS, Centers for Medicare and Medicaid Services (official abbreviation is CMS).

Hospital-based case-control studies; all other studies were population-based (ie, cases were identified from hospitals and registries).