Table 1

Characteristics of 76 Breast Cancer Association Consortium studies, and 130 957 study participants, included in the individual-level analysis

Study acronym*	Country	Diagnosis years	Invasive cases (N)	In situ cases (N)	Controls (N)
ABCFS	Australia	1963–2013	1117	–	187
ABCTB	Australia	2004–2013	920	6	375
BCEES	Australia	2009–2011	783	–	834
MCCS	Australia	1981–2012	870	180	978
HMBCS	Belarus	1994–2007	212	–	249
LMBC	Belgium	1994–2011	784	21	1268
CBCS	Canada	2005–2009	568	108	817
MTLGEBCS	Canada	2007–2011	341	–	170
OFBCR	Canada	1967–2015	1721	2	643
CGPS	Denmark	1981–2012	1408	3	716
EPIC	Europe (Multiple countries)	n.r.	3435	412	3597
HEBCS	Finland	1997–2012	281	–	177
KBCP	Finland	1990–2012	522	34	245
CECILE	France	2005–2007	280	26	159
BBCC	Germany	1988–2013	403	8	253
BSUCH	Germany	1990–2013	252	1	168
ESTHER	Germany	2001–2004	291	3	187
GC-HBOC	Germany	1947–2014	3378	256	1593
GENICA	Germany	2000–2004	459	1	284
GEPARSIXTO	Germany	n.r.	386	–	–
GESBC	Germany	1992–1995	312	39	181
HABCS	Germany	1984–2010	909	19	863
MARIE	Germany	2001–2005	506	6	289
PREFACE	Germany	2001–2011	2923	–	–
SKKDKFZS	Germany	1993–2005	1086	9	–
SUCCESSB	Germany	2008–2011	440	–	–
SUCCESSC	Germany	2001–2011	2836	–	–
CCGP	Greece	1983–2013	667	5	322
BCINIS	Israel	1999–2012	1337	100	724
MBCSG	Italy	1977–2012	549	72	366
ABCS	Netherlands	2003–2011	347	–	189
ORIGO	Netherlands	1991–2005	921	113	–
RBCS	Netherlands	1975–2009	444	23	–
NBCS	Norway	1973–2011	1163	38	–
PBCS	Poland	1998–2003	1740	111	2045
SZBCS	Poland	2010–2012	352	9	174
MABCS	Republic of North Macedonia	1993–2013	89	1	90
HUBCS	Russia	1977–2009	211	–	116
BREOGAN	Spain	1991–2019	1535	129	910
HCSC	Spain	1975–2013	423	3	–
KARBAC	Sweden	1966–2013	499	3	–
KARMA	Sweden	1969–2017	2839	339	6983
MISS	Sweden	1983–2013	633	68	1529
pKARMA	Sweden	1980–2015	748	86	48
SMC	Sweden	1987–2013	1509	–	661
BBCS	UK	1985–2009	122	–	440
DIETCOMPLYF	UK	2004–2007	708	3	–
FHRISK	UK	1987–2015	146	31	644
POSH	UK	2000–2007	1088	–	–
PROCAS	UK	1988–2018	380	93	1648
SBCS	UK	2012–2015	126	2	–
SEARCH	UK	2003–2012	4057	–	2653
UKBGS	UK	1985–2014	1048	584	705
UKOPS	UK	n.a.	–	–	974
2SISTER	USA	n.r.	919	151	–
AHS	USA	1994–2013	513	1	1137
BCFR-NY	USA	1949–2011	401	53	27
BCFR-PA	USA	1969–2011	67	6	–
BCFR-UTAH	USA	1952–2009	100	1	–
CPSII	USA	1992–2009	2393	598	3028
CTS	USA	1998–2010	1156	–	610
MCBCS	USA	1998–2014	749	167	212
MEC	USA	1972–2012	668	5	724
MMHS	USA	2003–2013	275	99	1635
MSKCC	USA	1982–2012	136	2	–
NBHS	USA	2001–2009	483	112	652
NC-BCFR	USA	1967–2012	759	15	150
NCBCS	USA	1993–2012	2074	315	1006
NHS	USA	1976–2012	1103	333	1804
NHS2	USA	1989–2011	1112	409	1905
PLCO	USA	1994–2013	1822	483	2595
SISTER	USA	2003–2008	1504	498	1556
TNBCC	USA	2003–2013	113	–	–
UBCS	USA	1960–2015	606	60	–
UCIBCS	USA	1994–2003	427	74	258
USRT	USA	1945–2005	1354	338	1699
Total		1945–2019	69 838	6667	54 452

*See online supplemental table S1 (Online Resource) for study names and references.
n.a., not applicable; n.r., not recorded.