Included studies.

Abbreviations: Guid. iCBT = guided internet-delivered cognitive behavioural therapy; FtF CBT = individual face-to-face cognitive behavioural therapy; NR = not reported; SD = standard deviation; ITT = intention to treat. aTailored intervention group. bStandardised intervention group. cTechnician assisted. dClinician assisted. eTransdiagnostic intervention. Adherence was reported, but not specifically for the depressed group. fMean and standard deviation estimated. gParticipants completing 12 or more sessions were considered completers, but there was no maximum amount of sessions.