Surname/year of first author of main paper	1: Mechanism of assignment: was the allocation or identification mechanism able to control for selection bias?	2. Group equivalence: was the method of analysis executed adequately to ensure comparability of groups throughout the study and prevent confounding?	3: Performance bias: was the process of being observed free from motivation bias?	4: Spill‐overs, cross‐overs and contamination: was the study adequately protected against spill‐overs, cross‐overs and contamination?	5: Selective outcome reporting: was the study free from selective outcome reporting?	6: Selective analysis reporting: was the study free from selective analysis reporting?	7: Other risks of bias: Is the study free from other sources of bias?	Are there any unit of analysis errors?	Final RoB Assessment
Hedge & Bull, 2011	No	No	Yes	No	Yes	No	Yes	No	Critical
Jindal, 2012	No	No	Yes	Yes	Yes	No	Yes	No	Critical
Garbach	Unclear	No	No	Unclear	Unclear	Unclear	Yes	No	Critical
Honey‐Roses (2011)	Unclear	Yes	Yes	Yes	Yes	Yes	Yes	No	Medium
Beauchamp, 2018	Unclear	Unclear	Yes	No	Yes	Yes	Unclear	No	Critical
Sharma, 2015	Unclear	Unclear	Yes	No	Yes	Yes	Yes	No	High
Arriagada, 2011	Unclear	No	Yes	Unclear	Yes	Unclear	Yes	No	High
Arriagada, 2012	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Low
Arriagada, 2015	Yes	Yes	Yes	Unclear	Yes	Unclear	Yes	No	Medium
Robalino, 2013	No	Unclear	Yes	No	Yes	Yes	Yes	Unclear	High
Robalino, 2014	Unclear	No	Yes	Unclear	Yes	Unclear	Yes	Unclear	High
Robalino, 2015—also checked Robalino 2008	No	Unclear	Yes	No	Yes	Unclear	Unclear	Unclear	Critical
Sierra, 2006	No	No	Yes	No	Yes	Unclear	Unclear	No	Critical
Alix‐Garcia, 2015a	Yes	Yes	Yes	Unclear	Yes	Yes	Yes	No	Medium
Arriagada, 2018	Unclear	Unclear	Yes	No	Yes	Yes	Unclear	Unclear	High
Le Velley 2017—Le Velley 2015 also checked	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Low
Scullion 2011	No	No	Yes	No	Yes	No	Yes	Unclear	Critical
Sims 2017	Unclear	Unclear	Yes	Yes	Yes	Yes	Yes	No	High
Liu, 2015	No	No	Yes	No	Yes	Unclear	Unclear	No	Critical
Liu, 2014	No	Unclear	Yes	No	Yes	Unclear	Unclear	No	Critical
Lin, 2014	No	No	Yes	No	Yes	Unclear	Unclear	No	Critical
Liu, 2018	Unclear	Unclear	Yes	No	Yes	Unclear	Unclear	No	Critical
Demurger, 2012	Unclear	No	Yes	Unclear	Yes	Unclear	Unclear	No	High
Duan, 2015	No	No	Yes	No	No	No	Unclear	No	Critical
Groom, 2010	Unclear	No	Yes	No	Yes	Yes	No	No	Critical
Liang, 2012	No	No	Yes	No	Yes	Unclear	Unclear	No	Critical
Uchida, 2009	No	No	Yes	No	No	Yes	Unclear	No	Critical
Xu, 2010	Unclear	Unclear	Yes	No	Yes	Unclear	Unclear	No	Critical
Yao, 2010	Unclear	No	Yes	No	Yes	Unclear	Unclear	No	Critical
Kwayu, 2017	No	No	Yes	No	Yes	Unclear	Unclear	Unclear	Critical
Lokina, 2016	No	No	Yes	No	Yes	Yes	Yes	Unclear	Critical
Hayes, 2017	Unclear	No	Yes	No	Yes	Yes	Yes	No	Critical
Jones, 2016	Unclear	Unclear	Yes	No	Yes	Yes	Yes	No	High
Mohebalian, 2016	Unclear	Unclear	Yes	No	Yes	Yes	Yes	No	High
Mohebalian, 2018	Unclear	Unclear	Yes	No	Yes	Yes	Yes	No	High
Jayachandran et al., 2017	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Low
Pagiola, 2013 (Pagiola, 2016 also checked)	Unclear	Unclear	Yes	Unclear	Yes	Yes	Yes	No	High
Chervier, 2017a	Unclear	Unclear	Yes	Yes	Yes	Yes	Yes	Unclear	High
Chervier, 2017b	No	Unclear	Yes	Yes	No	Yes	Yes	Unclear	High
Zhang, 2013	Unclear	No	Yes	No	Yes	Unclear	Yes	No	Critical
Jack, 2017	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Low
Simonet, 2017	No	Yes	Yes	Yes	Yes	Yes	Yes	No	High
Zhang, 2005	Unclear	No	Yes	No	Yes	Unclear	Unclear	No	Critical
Liu, 2014	No	Unclear	Yes	No	Yes	Unclear	Yes	No	Critical
Costedoat, 2015	Unclear	Yes	Yes	Yes	Yes	Yes	Yes	Unclear	Medium