Table 1.

Characteristics of the cohort studies in the pooled analysis

Study	Age at baseline (years)	Baseline survey	Last follow-up time	Follow-up yearsa	Size of the analytic cohort		Number of deaths		Current smokers
									Age at starting smoking regularly (years)b		Number of cigarettes per dayb
					Men	Women	Men	Women	Men	Women	Men	Women
JPHC-I	40–59	1990	2016	1 148 933 (26.5)	23 258	26 485	6438	3552	20 (19–21)	25 (20–35)	20 (15–30)	12 (8–20)
JPHC-II	40–69	1993–1994	2016	1 259 354 (22.9)	29 453	32 995	9914	6511	20 (19–21)	25 (20–34)	20 (20–30)	15 (10–20)
JACC	40–79	1988–1990	2009	1 781 319 (18.9)	44 139	64 190	15 401	12 009	20 (20–22)	30 (23–40)	20 (15–25)	10 (10–20)
MIYAGI	40–64	1990	2017, 2014 (cause-specific)	878 010 (27.6)	19 750	17 796	7076	3517	20 (20–24)	30 (23–39)	20 (18–30)	10 (8–20)
3-Pref MIYAGI	≥40	1984	1998	250 578 (15.0)	10 150	11 737	2353	1900	20 (20–22)	30 (23–40)	20 (15–25)	20 (10–20)
3-Pref AICHI	40–103	1985	2000	386 035 (15.2)	15 746	17 783	3241	2639	20 (19–21)	30 (23–37)	20 (15–30)	12 (10–20)
OHSAKI	40–79	1994	2008	435 207 (13.2)	20 403	19 875	4439	2357	20 (20–23)	30 (23–40)	20 (15–25)	10 (10–20)
LSS	46–104	1991	2003	258 482 (12.0)	9148	14 789	1979	3091	20 (19–20)	27 (22–35)	20 (15–30)	12 (10–20)
3-Pref OSAKA	40–99	1983–1985	2000	398 285 (15.0)	15 881	16 716	4071	2997	20 (19–21)	30 (23–38)	20 (15–30)	10 (7–20)
Total					187 928	222 366	54 912	38 573

JPHC-I, Japan Public Health Center-based Prospective Study, Cohort I; JPHC-II, Japan Public Health Center-based Prospective Study, Cohort II; JACC, Japan Collaborative Cohort Study; MIYAGI, Miyagi Cohort Study; 3-Pref MIYAGI, Three-Prefecture Miyagi; 3-Pref AICHI: Three-Prefecture Aichi; OHSAKI, The Ohsaki Cohort Study; LSS, Life Span Study; 3-Pref OSAKA, Three-Prefecture Osaka.

^aTotal (median).

^bMedian (interquartile range).