Study	Reason for exclusion
Asarnow 2011	Participants were not required to have engaged in SH prior to study entry.
Bjärehed 2013	Participants were not required to have engaged in SH prior to study entry.
Brent 2009	Not all participants were randomised to the intervention or control groups; some chose to receive the intervention treatment.
Carli 2011	Participants were not required to have engaged in SH prior to study entry.
Deykin 1986	Non‐randomised clinical trial.
Diamond 2010	Participants were not required to have engaged in SH prior to study entry.
Donaldson 1997	Non‐randomised clinical trial.
Dubois 1999	Greater than 10‐15% of the sample were older than 18 years of age at study entry.
Emslie 2006a	Participants were not required to have engaged in SH prior to study entry.
Emslie 2006b	Participants were not required to have engaged in SH prior to study entry.
Emslie 2007	Participants were not required to have engaged in SH prior to study entry.
Emslie 2009	Participants were not required to have engaged in SH prior to study entry.
Esposito‐Smythers 2006	Participants were not required to have engaged in SH prior to study entry.
Esposito‐Smythers 2011	Participants were not required to have engaged in SH prior to study entry.
Findling 2009	Participants were not required to have engaged in SH prior to study entry.
Fleischhaker 2005	Non‐randomised clinical trial in which data from only the intervention arm are presented.
Huey 2004	Participants were not required to have engaged in SH prior to study entry.
King 2006	Participants were not required to have engaged in SH prior to study entry.
King 2009
Miller 2000	Non‐randomised clinical trial.
Nixon 2003	Non‐randomised clinical trial.
Oldershaw 2012	Participants were not required to have engaged in SH prior to study entry.
Pineda 2013	Participants were not required to have engaged in SH prior to study entry.
Podobnik 2012	Participants were not required to have engaged in SH prior to study entry.
Ramani Perera 2011	Correspondence with study authors suggested alternate allocation to intervention and control groups, rather than true randomisation.
Robinson 2012	Participants were not required to have engaged in SH prior to study entry.
Robinson 2014	Participants were not required to have engaged in SH prior to study entry.
Rotheram‐Borus 1996	Non‐randomised clinical trial.
Sarchiapone 2013	Participants were not required to have engaged in SH prior to study entry.
Vitiello 2009	Not all participants were randomised to the intervention or control groups; some chose to receive the intervention treatment.
Wilkinson 2011	Participants were not required to have engaged in SH prior to study entry.
Xu 2006	Method of allocation to intervention and control groups unclear.

SH: self‐harm