TABLE 1.

Characteristics of six Japanese cohort studies: pooled analysis of the association between alcohol intake and stomach cancer risk, 1988‐2014

Study	Cohort	Age range at baseline survey (y)	Year of baseline survey	Cohort size	Response rate (%) for baseline questionnaire	Method of follow‐up	Present pooled analysis							Outcome
							Age range (mean ± SD, y)	Last follow‐up	Mean follow‐up period (y)	Size of the cohort		Number of stomach cancer cases
										Men	Women	Men	Women
JPHC Study I	Japanese residents of 5 public health center areas in Japan	40‐59	1990	61 595	82.0	Cancer registry and death certificate	40‐59 (49.5 ± 5.9)	2013	21.0	20 239	21 633	1121	439	Incidence
JPHC Study II	Japanese residents of 6 public health center areas in Japan	40‐69	1993‐1994	78 825	80.0	Cancer registry and death certificate	40‐69 (53.3 ± 8.9)	2013	17.3	28 080	31 909	1294	538	Incidence
JACC Study	Residents from 45 areas throughout Japan	40‐79	1988‐1990	110 585	83.0	Cancer registry (selected areas: 24) and death certificate	40‐79 (57.8 ± 10.2)	2009	15.7	22 388	33 239	962	585	Incidence
Miyagi Cohort Study	Residents of 14 municipalities in Miyagi Prefecture, Japan	40‐64	1990	47 605	92.0	Cancer registry and death certificate	40‐64 (51.6 ± 7.5)	2014	21.2	21 074	18 696	1438	453	Incidence
Ohsaki Cohort Study	Residents of 14 municipalities in Miyagi Prefecture, Japan	40‐79	1994	52 029	95.0	Cancer registry and death certificate	40‐79 (59.6 ± 10.4)	2008	10.7	21 370	19 618	958	309	Incidence
Life Span Study	Atomic bomb survivors in Hiroshima and Nagasaki, Japan a	46‐104	1991	20 147	100	Cancer registry and death certificate	46‐104 (62.6 ± 11.6)	2003	10.7	6800	11 432	278	211	Incidence

Abbreviations: JACC, Japan Collaborative Cohort Study; JPHC, Japan Public Health Center‐based Prospective Study.

^a Life Span Study originally started in 1950, and subjects who responded to the 1991 survey were analyzed for the present pooled analysis.