Table 1.

Descriptive summary of two U.S. studies of Barrett’s esophagus, which were harmonized and included in our pooled study.

	Study of Reflux Disease	Epidemiology and Incidence of BE
Study Design	Community-based case-control study	Community-based case-control study
Time and Location	Western Washington, 1997-2000	Northern California, 2002-2005
Sample Size	193 BE cases, 211 controls	320 BE cases, 317 controls
FFQ (# items)	FHCRC (131)	Block 98 (110)
Frequency of Consumption	Never or less than once per month, 1 per month, 2–3 per month, 1 per week, 2 per week, 3–4 per week, 5–6 per week, 1 per day	Never or less than once per month, 1 per month, 2–3 per month, 1 per week, 2 per week, 3–4 per week, 5–6 per week, 1 per day
Serving Size	Small, medium, large	1/4 cup, 1/2 cup, 1 cup, 2 cups

FFQ: food frequency questionnaire

FHCRC: Fred Hutchinson Cancer Research Center