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

Plain English Summary

Background and study aims
Worldwide, research and policy authorities acknowledge multidimensional family therapy (MDFT) as an effective treatment for adolescents with behavioral problems such as substance abuse and delinquency (criminal behaviour). MDFT is a type of behavioural treatment which improves the lives of adolescents and their families by targeting different areas of life. Treatment is organized into three stages: building a foundation for change, helping the patient and their family to change, and solidifying these changes. In recent years, both the Geneva and Paris MDFT teams have seen an increase of youth/families seeking treatment for adolescent Internet Gaming Disorder (IGD), an addiction to online gaming. These cases are being treated with MDFT, but more evidence about the effectiveness of MDFT in treating IGD is needed. The aim of this study is to investigate the effectiveness of MDFT in the treatment of IGD. The study takes place in Geneva, where adolescents receiving MDFT are compared to adolescents receiving standard family therapy, and in Paris, where all adolescents receive MDFT.

Who can participate?
Adolescents aged between 13 and 18 who are showing signs of gaming addiction and their parents.

What does the study involve?
In Geneva, participants are randomly allocated to one of two groups. Those in the first group take part in a six month programme of MDFT. The therapy is given in three stages, the first to motivate participants and create a treatment plan, the second to target the problem behaviour and improve family relationships and the third to seal off treatment and make a plan for what to do if the adolescent starts showing signs of gaming addiction. The therapy sessions involve an equal amount of sessions with the adolescent alone, with the parent(s) alone, and with the family (adolescent plus parents). The number of sessions per week can vary but on average there are two 30-90 minute sessions per week. Between sessions, the therapist keeps in regular contact with the adolescent and parent(s) through phone, email and other social media. Those in the second group receive family therapy as usual. The type of therapy varies and does not follow any specific stages. Sessions can take place anytime between once a week and once a month. At the start of the study and then again after six and 12 months, adolescents and their parent(s) complete a number of questionnaires and are interviewed in order to assess how much the adolescent is gaming, their mental wellbeing and how they are doing in school.
In Paris, all participants take part in the six month programme of MDFT. This involves the same methods used in the Geneva study and participants are also followed up after six and 12 months.

What are the possible benefits and risks of participating?
Participants may benefit from reduced addictive behaviour (less Internet gaming), freeing time for more healthy behaviours. There are no known risks associated with participating.

Where is the study run from?
1. Fondation Phénix (Switzerland)
2. Centre Pierre Nicole, Croix Rouge Française (France)
3. Clinique Dupré (France)

When is the study starting and how long is it expected to run for?
August 2016 to March 2020

Who is funding the study?
Action Innocence (Switzerland)

Who is the main contact?
1. Dr Henk Rigter (public)
2. Mr Philip Nielsen (public)

Trial website

Contact information



Primary contact

Dr Henk Rigter


Contact details

Department of Adolescent and Child Psychiatry
Leiden University Medical Center
P.O. Box 15
2300 AA



Additional contact

Mr Philip Nielsen


Contact details

Fondation Phénix
21-23 Rue des Rois

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Assessing the potential of Multidimensional Family Therapy (MDFT) and family treatment as usual to reduce Internet gaming and Internet gaming disorder in 13 to 18 years old adolescents from treatment sites in Geneva and greater Paris



Study hypothesis

1. For the Geneva and Paris adolescents, Multidimensional Family Therapy (MDFT) will decrease the frequency of gaming going from baseline to 6 and 12 months follow-up
2. For Geneva, this decline will be larger for MDFT than for family treatment as usual (FTAU).
3. For the Geneva and Paris adolescents, MDFT will reduce the prevalence of the IGD diagnosis from 100% at baseline to significantly lower values at 6 and 12 months follow-up
4. In Geneva, IGD prevalence rate will drop more strongly for MDFT than for FTAU

In Geneva, the study is a randomised controlled trial (comparing MDFT and FTAU) and in Paris all participants receive FTAU. The Paris component has been added to aid the interpretation of the validity of the Geneva data.

Ethics approval

Commission Cantonale d'Ëthique de la Recherche (CCER), 07/09/2016, ref: 2016-01344

Study design

Multi-centre randomised controlled trial

Single-group non randomised study

Primary study design


Secondary study design

Randomised controlled trial and non-randomised study

Trial setting


Trial type


Patient information sheet

Not available in web format. Please use contact details to request a participant information sheet.


Internet Gaming Disorder (IGD)


Geneva Study:
Participants are randomised to one of two groups using concealed randomisation procedures with database generated allocation to treatment group.

Intervention group: Participants receive Multidimensional Family Therapy (MDFT), an outpatient treatment programme lasting 6 months. MDFT is administered in three stages. The first one focuses on intensively enhancing treatment motivation, building multiple therapeutic alliances, and drafting the treatment plan. In stage 2, treatment plan interventions targeting the youth and his or her family are carried out, including education about adolescence, behavioural development, and risk factors for problem behaviour; relapse prevention; improving family communication and relationships; and strengthening parental educational skills. Stage 3 involves sealing off the treatment, agreeing on a relapse prevention plan, and providing booster sessions if needed. MDFT comprises three types of sessions:
1. Sessions with the adolescent alone
2. Sessions with only the parents (one parent [figure] or both parents)
3. Sessions with the family ( adolescent plus parents)
These sessions are held in roughly equal proportion and last for 30 – 90 minutes. They may take place at the office of the treatment centre or at the family’s home or any other convenient place. The number of sessions varies from week to week, but on average 2 sessions per week are held. In between sessions, the therapists use phone, email and other social media to remain in touch with adolescent and parents, to check if they adhere to actions agreed upon, and to encourage them.

Control group: Participants receive Family Therapy as Usual (FTAU). This involves family therapy best-practice procedures as taught locally (in Geneva) to systems-oriented therapists. The methods used are eclectic, combining elements from structural-strategic, narrative and solutionist family therapy. Unlike in MDFT, there are no specific treatment stages in FTAU. As in MDFT, alliance building and improving relations and communication within the family are common targets of treatment. Also in FTAU, three types of sessions are held, i.e. with the adolescent alone, the parents alone, and with the family, in roughly equal proportion.
Treatment intensity is much lower for FTAU than for MDFT. Typically, the rhythm of sessions fluctuates between once a week and once a month. FTAU therapists are not actively working on their cases in between sessions, with the exception of monthly supervision sessions. As a result, FTAU therapists’ caseloads are 3 to 4 times higher than MDFT therapist caseloads.

Follow up for all participants involves two assessments of gaming behaviour, mental health, family functioning and school functioning. The first of these assessments is at 6 months after baseline/allocation to treatment group, so at the time the treatments ends. The second one is at 12 months after baseline/allocation to treatment group.

Paris/Sceaux Study:
All participants receive Multidimensional Family Therapy (MDFT), which follows the same methodology as the MDFT in Geneva. Follow up is the same as in Geneva and therefore involves two assessments, i.e. at 6 and 12 months after baseline.

Intervention type



Drug names

Primary outcome measure

1. Frequency of gaming is measured using the TimeLine Follow-Back (FLFB) at baseline, 6 and 12 months
2. Prevalence of internet gaming disorder diagnosis is measured using the IGD consensus scale at baseline, 6 and 12 months

Secondary outcome measures

1. Mental health status and symptoms of the adolescent will be measured with the well-validated Youth Self-Report (YSR) and with the Rotterdam Well-being of Youth Scale (R-WYS) at baseline, 6 and 12 months
2. The parents’ view of their child’s mental health status and symptoms will be assessed with the well-validated Child Behavior Checklist (CBCL) and with the R-WYS, parent version, at baseline, 6 and 12 months
3. Family functioning/communication will be measured in the Adolescent Interview and Parent Interview at baseline and 12 months
4. Parental supervision is assessed in the Adolescent and Parent Interviews at baseline and 12 months
5. School functioning of the adolescent will be measured using the Rotterdam Well-being of Youth Scale (R-WYS) and Adolescent and Parent Interviews at baseline, 6 and 12 months
6. Treatment retention is assessed using treatment contact logs throughout the 6 months of treatment
7. Treatment adherence is measured through a random sample of MDFT family sessions (midway treatment: at 3 months) being recorded on tape/disc and analysed for adherence to MDFT principles, using the 16-item MDFT Adherence Scale

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Adolescents aged 13 - 18 years old
2. Meeting 5 or more of the 9 criteria from the IGD consensus scale
3. At least one parent is willing to take part in the treatment and the study
4. Both adolescent and parent master the local language (French and English in Geneva, and French in Paris)
5, Informed consent by the adolescent and parent(s)

Participant type


Age group




Target number of participants

N = 80

Total final enrolment


Participant exclusion criteria

Adolescents who require inpatient treatment because of psychosis, advanced eating disorder, or severe suicidal ideation.

Recruitment start date


Recruitment end date



Countries of recruitment

France, Switzerland

Trial participating centre

Fondation Phénix
21–23 Rue des Rois

Trial participating centre

Centre Pierre Nicole, Croix Rouge Française
27, rue Pierre Nicole

Trial participating centre

Clinique Dupré
30, Avenue Franklin Roosevelt

Sponsor information


Fondation Wilsdorf

Sponsor details

Place d'Armes 20

Sponsor type




La Loterie Romande

Sponsor details

Case Postale 3375

Sponsor type




Funder type


Funder name

Action Innocence

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Recruitment will start in October 2016. The Final Report on the study will be ready by the end of December 2018. Publications will be submitted to journals in Spring 2019.

IPD sharing statement
The datasets generated during and/or analysed during the current study are/will be available upon request from Dr Henk Rigter. The request should be accompanied by a study proposal. If the data are relevant for the study proposed, Dr Rigter will advise Dr Marina Krokar, director of treatment centre Phénix in Geneva – the formal owner of the database – to give the researchers concerned access to the database under standard conditions (privacy, etc).

Intention to publish date


Participant level data

Available on request

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

07/04/2020: The following changes have been made: 1. The intention to publish date has been changed from 21/10/2019 to 31/08/2020. 2. The total final enrolment number has been added. 12/09/2019: IPD sharing statement added. 10/09/2019: The following changes were made to the trial record: 1. The recruitment end date was changed from 15/10/2017 to 01/03/2019. 2. The overall trial end date was changed from 31/12/2018 to 01/03/2020. 3. The intention to publish date was changed from 01/03/2019 to 21/10/2019.