Study	Reason for exclusion
Amundsen 2000	No data on progestagen type or ethinylestradiol dose
Austin 2009	Other hormonal contraceptives, such as transdermal patch, vaginal ring, were included
Barsoum 2010	No data on progestagen type or ethinylestradiol dose
BCDSP 1973	No data on progestagen type or ethinylestradiol dose
Bergendal 2012	No data on progestagen type or ethinylestradiol dose
Bernstein 1986	No data on progestagen type or ethinylestradiol dose
Bonifacj 1997	Included recurrent venous thrombosis
Bottiger 1980	No data on ethinylestradiol dose
Burnhill 1999	Included progestagen‐only contraceptives and retinal vein thrombosis
Diddle 1978	Less than 10 venous thrombosis cases
Dinger 2007	Included recurrent venous thrombosis
Dinger 2010	Included recurrent venous thrombosis
Eng 2008	Compared drospirenone versus other oral contraceptive users
Farmer 1997	Ecologic study
Fuertes 1971	Unclear reference group
Gerstman 1991	Incomplete data on contraceptive use
Girolami 2004	Included not only venous thrombosis
Grodstein 1996	No data on progestagen type or ethinylestradiol dose
Grounds 1974	Included not only venous thrombosis
Hall 2012	No data on venous thrombosis
Hedenmalm 2005	Included recurrent venous thrombosis and cerebral vein thrombosis
Heinemann 2000	Report on Transnational study, already included (Lewis 1996, Lewis 1999)
Helmrich 1987	Incomplete data on contraceptive use
Herings 1999a	Data already included: Herings 1999
Heuser 2004	No extractable number of exposed and non‐exposed women
Hirvonen 1990	No data on progestagen type or ethinylestradiol dose
Huerta 2007	No data on progestagen type or ethinylestradiol dose
Inman 1968	No data on progestagen type or ethinylestradiol dose
Inman 1970	No data on progestagen type or ethinylestradiol dose
IPPF 1976	Communication to the editor
Kieler 2003	Included recurrent venous thrombosis
Lambrekht 1986	No data on venous thrombosis
Lawrenson 2000	Review
Legnani 2002	Included recurrent venous thrombosis
Lewis 1997	Report on Transnational study, already included (Lewis 1996)
Lewis 1999b	Report on Transnational study, already included: Lewis 1996, Lewis 1999)
Lewis 1999c	Commentary
Lidegaard 1998a	Updated study see Lidegaard 2002
Lidegaard 1998b	Review
Lidegaard 2001	Review
Lidegaard 2009	Updated study of this 2009 study (Lidegaard 2011) is included
Lindqvist 2009	No data on progestagen type or ethinylestradiol dose
Lis 1993	Publication of study protocol
Ludwig 1970	Unclear what is defined as high progestagen
Martinelli 2003	No data on progestagen type or ethinylestradiol dose
Meade 1980	Included not only venous thrombosis
Meinel 1988	Included not only venous thrombosis and no data on progestagen type or ethinylestradiol dose
Meurer 2001	Review
Nightingale 2000	2000 443 Duplicate report on GPRD (Farmer 2000) and Mediplus Databases (Todd 1999)
Overgaard 1986	No data on progestagen type or ethinylestradiol dose
Pearce 2005	No comparison was included
Petitti 1979	No data on progestagen type or ethinylestradiol dose
Pini 1996	Included not only venous thrombosis and included recurrent venous thrombosis
Porter 1982	Less than 10 venous thrombosis events
Porter 1985	Less than 10 venous thrombosis events
Poulter 1996	Data already included (WHO 1995)
Primignani 2005	Included not only venous thrombosis
Quinn 1992	No data on progestagen type or ethinylestradiol dose
RCPG 1978	Included not only venous thrombosis
Realini 1997	Less than 10 venous thrombosis events
Reed 2012	Compared with other contraceptives
Roach 2013	No data on progestagen type or ethinylestradiol dose
Seaman 2004	Included recurrent venous thrombosis
Seeger 2007	Included recurrent venous thrombosis
Seigel 1969	No data on progestagen type or ethinylestradiol dose
Sidney 2004	Incomplete data on contraceptive use
Spitzer 1993	Publication of study protocol
Stolley 1975	Included not only venous thrombosis
Suissa 1997	Duration of contraceptive use on Transnational study, already included (Lewis 1996, Lewis 1999)
Thorogood 1992	Included recurrent venous thrombosis and no data on progestagen type or ethinylestradiol dose
Tosetto 2003	No data on progestagen type or ethinylestradiol dose
Tsankova 2010a	Compared ever users versus never users
Tsankova 2010b	No data on progestagen type or ethinylestradiol dose
Ulmer 1997	No data on progestagen type or ethinylestradiol dose
Vallee 2001	Review
Van der Meer 1997	Review
Vessey 1969	Included recurrent venous thrombosis
Vessey 1986	Incomplete data on contraceptive use
WHO 1989	No data on progestagen type or ethinylestradiol dose
Worralurt 2005	Included recurrent venous thrombosis and no data on progestagen type or ethinylestradiol dose
Yang 2007	Exposed consisted of hormone replacement therapy users and oral contraceptive users