Study	Reason for exclusion
Bozzatello 2017	At baseline, < 100% of the sample had engaged in SH.
Crawford 2018	At baseline, 53.3% had engaged in SH within six months of trial entry.
Domany 2019	At baseline, < 100% of the sample had engaged in SH.
Grant 2016	Participants were diagnosed with skin‐picking disorder.
Grunebaum 2012	At baseline, < 100% of the sample had engaged in SH.
Marriott 2016	Study protocol. However, unlikely that all participants will have engaged in SH at baseline.
McCall 2018	At baseline, < 100% of the sample had engaged in SH.
NCT00065936	Trial registration record last verified 1 May 2003. Current trial status therefore unknown.
NCT00533117	At baseline, < 100% had engaged in SH within six months of trial entry.
NCT00539188	Trial terminated early due to poor participant adherence.
NCT01103180	Trial terminated due to feasibility problems in identifying and recruiting participants.
NCT01928446	Trial terminated early due to Data Monitoring Committee (DMC) recommendations.
NCT02039479	Trial registration record last verified 1 March 2018. Current trial status therefore unknown.
Oquendo 2011	At baseline, < 100% had engaged in SH within six months of trial entry.
Yovell 2016	At baseline, 64.5% of the sample had engaged in SH.

DMC: data monitoring committee; SH: self‐harm.