Study	Reason for exclusion
Ahmad 2012	Wrong exposure (not green tea)
Allen 2011	Wrong exposure (not green tea)
Alsanad 2016	Wrong patient population
Amarasinghe 2013	Wrong outcomes
Arts 2001	No distinction between green and black tea
Asgari 2011	Wrong exposure (not green tea)
Askari 2014	Wrong exposure (not green tea)
Azeem 2013	Wrong exposure (not green tea)
Bailey 2017	Paediatric population
Bamia 2015	Wrong exposure (not green tea)
Bao 2015	Wrong patient population
Baroudi 2014	Wrong exposure (not green tea)
Bates 2007	Wrong exposure (not green tea)
Bianchi 2000	No distinction between green and black tea
Bonaventure 2013	Paediatric population
Butler 2015	Wrong exposure (not green tea)
Chen 2009	Wrong exposure (not green tea)
Chyou 1995	No green tea
DArena 2013	Wrong patient population
Deandrea 2010	Wrong exposure (not only green tea)
Emami 2014	Wrong study design
Ettrich 2012	Wrong outcomes
Ferrucci 2014	Wrong exposure (not green tea)
Gao 2002	Wrong exposure (not green tea)
Gao 2009	Wrong exposure (not green tea)
Hara 1984	Participants all people with cancer
He 2017	Wrong exposure (not green tea)
Henning 2012	Wrong outcomes
Ide 2008	Wrong exposure (not green tea)
Il'yasova 2003	No distinction between green and black tea
Inoue 1997	Participants all people with cancer
Inoue 2001	Study does not address cancer
Ishizuka 2003	Measured gallstones
Jatoi 2003	Participants all people with cancer
Jia 2012	Cases not only people with cancer but included also participants with pre‐cancerous lesions
Johnson 2011	Wrong exposure (not green tea)
Kono 1991	Measured polyps of the colon
Kuwahara 2000	Measured atrophic gastritis
Lee 1990	Mixed reporting of results for oolong, black and green tea No distinction between at least 2 amounts of frequency of green tea consumption
Lee 2013	Wrong exposure (not green tea)
Liu 2013a	Wrong exposure (not green tea)
Liu 2014	Wrong exposure (not green tea)
Liu 2015	Wrong outcomes
Luo 2010	Wrong exposure (not green tea)
Menzler 2015	Wrong outcomes
Mineharu 2011	Wrong outcomes
Montella 2007	No distinction between green and black tea
Montella 2009	No distinction between green and black tea
Nagano 2000	Summarised and added new data in Nagano 2001
Nakachi 1998	Participants all people with cancer
Nakachi 2003	Paper reviews Nakachi and colleague's 1998 study, participants all people with cancer
Oguni 1992	Abstract only, insufficient data
Ohno 1985	No amount of frequency of green tea consumption specified
Ohno 1995	"Okinawa tea" consumption, which is half‐fermented oolong tea
Parodi 2017	Wrong exposure (not green tea)
Pisters 2001	Participants all people with cancer
Ren 1991	Type of tea not specified
Sasazuki 2008	Wrong exposure (not green tea)
Sasazuki 2012	Wrong study design
Sawada 2017	Wrong study design
Seo 2013	Wrong outcomes
Shibata 2000	Measured atrophic gastritis
Shim 1995	Study does not address cancer
Shimizu 2008	Wrong outcomes
Shin 2018	Wrong outcomes
Stingl 2011	Wrong outcomes
Suganuma 1999	Wrong study design
Sun 2002	Not clear green tea exposure, but urinary oesophagogastroduodenoscopy
Tong 2014	Wrong study design
Tsubono 1997	Not related to cancer risk factors
Tsugane 2014	Wrong study design
Wakai 1993	Participants all people with cancer
Wang 2002	No cancer (precancerous lesions)
Wang 2008	Wrong exposure (not green tea)
Wang 2010	Wrong study design
Wang 2012d	Wrong patient population
Wang 2012e	Wrong study design
Wang 2014a	Wrong study design
Wu 2003a	Amount of frequency of green tea consumption not specified
Wu 2013a	Wrong study design
Yu 1991	Amount of frequency of green tea consumption not specified, not green tea only
YuanJ M 2007	Wrong exposure (not green tea)
Zeegers 2001a	Wrong exposure (not green tea)
Zeegers 2001b	Wrong study design
Zhang 2004	Follow‐up study to Zhang 2002, participants all people with cancer
Zhang 2006	Results did not differentiate between black and green tea drinkers
Zhang 2009	Wrong exposure (not green tea)
Zhang 2013	Wrong exposure (not green tea)
Zhang 2016	Wrong outcomes
Zhu 2016	Wrong exposure (not green tea)