Condition category
Mental and Behavioural Disorders
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Both in the USA and the UK, approximately 20% of sexual assaults have been committed by juveniles under the age of 18. Comparable data have been found for sexual assaults in Switzerland (Swiss Federal Institute for Statistics, 2009). Thus, sexual crimes committed by juveniles represent a serious problem in society. Quite often adequate responding to juveniles who have sexually offended (JSO) is a major challenge for the judicial and social systems. In the interest of public safety and reduction of the risk of re-offending, courts have to decide on incarceration, detention placement, and treatment responses to JSO. A number of studies found that juveniles who have sexually offended (JSO) have deficits in social and sexual functioning. In order to prevent further offences by these youths, forensic treatment programs have been developed that include specific relapse preventions techniques and social skills training. However, so far it is unclear if these treatment programs for JSO work and may finally reduce the risk of further sexual and non-sexual reoffending. Therefore, the present study aims to evaluate two versions of a treatment program for an adequate sexual behaviour.

Who can participate?
Juveniles of both sexes between 10 and 18 years who have been convicted of a sexual offence (other than pornography offences) in the Canton of Zurich or the Canton of Basel (Switzerland) may participate in the study.

What does the study involve?
Two versions of a sexual offender treatment program will be compared. One version includes specific relapse prevention techniques based on the understanding of the own offending behaviour, the other version includes training of social and emotional skills associated with juvenile sexual behaviour. JSOs will be allocated to one of the two treatment groups (at random) or will be included in a control group that will receive no treatment. The juvenile prosecutors will decide if a JSO receives treatment or is included in the control group. All participants will be invited to complete questionnaires at three assessment points at the beginning, after six month (post treatment) and after 12 month follow up.

What are the possible benefits and risks of participating?
Treatment is part of the sanction applied by the juvenile prosecutors and is not voluntary. However, JSO and their parents are free to decide if they participate in the study and complete the questionnaires. If a treatment is made compulsory by the juvenile prosecutors the participants will be informed that they will randomly allocated to one of the two treatments. It is expected that participants will benefit from social skills training and from teaching relapse prevention techniques equally in order to prevent further criminal behaviour. Participants will receive 50 Swiss Francs for each of the three assessment points of the study. There are no side effects of the two treatment conditions expected.

Where is the study run from?
The study is running in Zurich and Basel and includes two centres: 1) Child and Adolescent Forensic Psychiatry, University of Zurich and 2) Child and Adolescent Forensic Psychiatry of Basel. The lead centre is in Zurich.

When is the study starting and how long is it expected to run for?
The study officially started on 01/10/2011and is expected to run until 30/03/2016. Recruitment and randomization will start on 07/12/2011 and end on 01/10/2014.

Who is funding the study?
The study is funded by the Swiss Department of Justice.

Who is the main contact?
Dr Cornelia Bessler

Trial website

Contact information



Primary contact

Dr Cornelia Bessler


Contact details

Neptunstrasse 60
+41 43 556 40 40

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Efficacy of relapse prevention techniques and social skills training for juveniles who have sexually offended: a randomized study


Study hypothesis

1. Knowledge on individual risk factors for sexual re-offending will increase in juveniles who receive specific relapse prevention techniques compared to juveniles who receive social skills training
2. Social problems and withdrawal will decrease in juveniles who receive social skills training compared to juveniles who receive specific relapse prevention techniques
3. Do juveniles who receive specific relapse prevention techniques differ from juveniles who receive social skills training regarding self and official reported sexual and non-sexual recidivism?

Ethics approval

Local Ethics Committee of the Canton of Zurich, Switzerland, 17/11/2011 ref: KEK-ZH-Nr. 2010-0483

Study design

Longitudinal randomized blinded treatment study

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Child and adolescent forensic psychiatry


Treatment arm 1: Social skills training is conceptualized as a cognitive behavioural training that includes communication training, problem solving training, resistance against delinquent peers and enhancement of emotional skills.
Treatment arm 2: Relapse prevention techniques include the individual understanding of the own sexual crimes by self-analyzing of their own behaviours, thoughts and emotions before, during and after the offense. Juveniles are invited to identify own individual risk factors and to formulate alternative behaviours.

Both treatment arms consist of 12 sessions of 120 minutes within 3 to 4 months (1 session per week). Treatment can be applied in group or individual sessions. Both treatment arms, will include sexual and judicial education and victim empathy training.

Intervention type



Not Applicable

Drug names

Primary outcome measures

Knowledge of individual risk factors, social problems and withdrawal measured using the Youth Self Report and RiskFact-KJ at the beginning, after six month (post treatment) and after 12 month follow up using self report instruments

Secondary outcome measures

Sexual and non-sexual recidivism assessed at the beginning, after six month (post treatment) and after 12 month follow up using self report instruments

Overall trial start date


Overall trial end date


Reason abandoned


Participant inclusion criteria

Juveniles of both sexes aged between 10-18 years who are officially adjudicated of a sexual offense other than pornography

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Intelligence Quotient (IQ) < 70
2. Insufficient knowledge of the German language
3. Other serious violent offenses such as murder, manslaughter and serious assaults
4. Psychiatric disorders such as drug dependence, schizophrenia, major depression, suicidality and any form of paraphilia
5. Neurological disorders

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Neptunstrasse 60

Sponsor information


Child and Adolescent Psychiatric Service, Canton of Zurich (Switzerland)

Sponsor details

c/o Dr Cornelia Bessler
Neptunstrasse 60
+41 43 556 40 40

Sponsor type




Funder type


Funder name

Swiss Department of Justice (Switzerland)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Funder name

Juvenile Prosecution of the Canton of Zurich (Switzerland)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Results - basic reporting

Publication summary

Publication citations

Additional files

Editorial Notes