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
Disruptive behaviors such as hyperactivity, aggression, oppositional (challenging) and conduct problems are among the most common behavioral and mental health problems in childhood. These problems are often jointly referred to as externalizing disorders (EDs), the most common of which are such as ADHD and conduct disorder. EDs are widespread, prolonged, and costly to society. If a child is suffering from an ED, then they are more likely to develop mental health problems as an adult, as well as more prone to substance use disorders, school-drop out, crime and violence. It is possible for children to have more than one ED, as they often share common risk factors. Targeting these risk factors therefore could provide an opportunity for prevention. The Community Parent Education Program (COPE) is a new parent training program, designed to help parents develop skills to strengthen their relationships with their children, increase cooperation and solve problems. The aim of this study is to investigate the effectiveness of COPE at preventing disruptive behavior and improving mental health in children.

Who can participate?
Parents of children aged 4 and 5 years who have problems controlling their behaviour, who previously participated in the “Découvrir, Développer, Devenir” (3D) Study.

What does the study involve?
At the start of the study, participants are asked to complete an online questionnaire twice, about 6 months apart, which should take around 90 minutes to complete. Parents and children are also invited to complete a series of computer and other games at home. Each home visit will take 60 minutes maximum. Participants are asked to provide the name and contact details of a person that knows your child well but who does not live with them (e.g. educator, caregiver, extended family member or friend), to invite him/her to complete an online questionnaire about the child’s personality and behaviour. Families are then randomly allocated to one of two groups. Those in the first group are invited to participate in a parent-training program (COPE), which consists of 10 weekly two hour group sessions. Each of the 10 weekly sessions of 2 hours addresses different topics related to early child behaviour and parental problem-solving strategies. Those in the second group continue as normal for the duration of the study. At the end of the study, the questionnaires from the start of the study are repeated to find out if there has been any change to the child’s behavior.

What are the possible benefits and risks of participating?
Parents who are allocated to the COPE group benefit from 10 free sessions of a program delivered by trained facilitators that has been shown to be effective in improving parenting skills and reducing behavioural problems and/or attention problems in children 3 to 12 years old. There are no notable risks involved with taking part in this study.

Where is the study run from?
1. Université de Montréal (Canada)
2. Sainte Justine Hospital (Canada)

When is the study starting and how long is it expected to run for?
January 2016 to December 2017

Who is funding the study?
Canadian Institutes of Health Research (Canada)

Who is the main contact?
Dr Natalie Castellanos Ryan

Trial website

Contact information



Primary contact

Dr Natalie Castellanos Ryan


Contact details

École de Psychoéducation
Université de Montréal
Pavillon Marie-Victorin
Bureau C-414
av. Vincent-d'Indy
H2V 2S9

Additional identifiers

EudraCT number number

Protocol/serial number

MOP – 143049

Study information

Scientific title

Using a randomized control trial to test developmental models of individual factors by environment interaction in the prediction of externalizing psychopathology across early school years


3D Transition RCT

Study hypothesis

Compared to children of parents randomised to a no-intervention control condition, children of parents randomized to a parent-skills training intervention will have fewer externalising symptoms and diagnoses at post-test (2 months post-intervention).

Ethics approval

Le Comité d’éthique de la recherche du CHU Sainte-Justine (Sainte Justine hospital research ethics committee), 09/08/2016, ref: 2016-1143

Study design

Single-centre open-label randomised controlled trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting

Not specified

Trial type


Patient information sheet

No participant information sheet available


Externalising disorders


Once parents consent to the study, they will complete a baseline questionnaire and assessment and be randomised to an intervention or control condition (simple randomization, at a ratio of 1:1) using a computer-generated random numbers list.

Intervention arm: Parents will receive the Community Parent Education Program (COPE) delivered at Ste Justine Hospital or other premises of the Université de Montréal. The COPE is manual-based and designed to help parents develop proven skills to strengthen their relationships with their children, increase cooperation and solve problems. COPE is a group-based program of 10-20 parents, who will meet with one or two trained facilitators for 10 weekly 2-hour sessions (so total duration 10 weeks).

Control arm: Parents will not receive any intervention or treatment.

Both groups will be assessed about 6 months post-randomization (roughly 2 months post-intervention for intervention participants).

Intervention type



Drug names

Primary outcome measure

Externalizing symptoms (i.e., conduct disorder, Attentional Deficit and Hyperactivity Disorder (ADHD) and Oppositional Defiance Disorder (ODD) symptoms) are measured using the Strengths and Difficulties Questionnaire (SDQ) and the Social Behavior Questionnaire, rated by the parent and another person “most knowledgeable of the child outside the family” (e.g. teachers) at baseline and 6 months.

Secondary outcome measures

1. Child temperament is measured by parent-reported Children’s Behavior Questionnaire at baseline and 6 months
2. Child mental health is measured by parent-reported Child Behavior checklist at baseline and 6 months
3. Response inhibition is assessed by an online version of the Flanker test of the NIH Toolbox ( at baseline and 6 months
4. School-engagement and performance is measured using homeroom teacher-reports at baseline and 6 months
5. Parent-child relationship and parenting styles and stress are assessed with the Block Child Rearing Practices Report, the Parenting Stress Index—Short Form and the Perceived Stress Scale at baseline and 6 months

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Parent-child dyads who have taken part in the “Découvrir, Développer, Devenir” (3D) Study (a large pregnancy study that collected data across pregnancy and the first two years of the child’s life of 1594 mothers and their children. IRNPQEO:
2. Children who score low on parent-reported self-regulation at 2 years of age (i.e. score below the mean reported in the 3D sample)

Participant type


Age group




Target number of participants


Participant exclusion criteria

Not meeting inclusion criteria

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Université de Montréal
École de Psychoéducation Pavillon Marie-Victorin 90, av. Vincent-d'Indy Outremont
H2V 2S9

Trial participating centre

Sainte Justine Hospital
3175 Chemin de la Côte-Sainte-Catherine
H3T 1C4

Sponsor information


Canadian Institutes of Health Research

Sponsor details

Room 97
160 Elgin Street
K1A 0W9

Sponsor type




Funder type


Funder name

Canadian Institutes of Health Research

Alternative name(s)

Instituts de Recherche en Santé du Canada, CIHR

Funding Body Type

government organisation

Funding Body Subtype

Federal/National Government



Results and Publications

Publication and dissemination plan

Planned publication in a high-impact peer reviewed journal.

Intention to publish date


Participant level data

Stored in repository

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

12/12/2018: The overall trial end date was changed from 31/12/2017 to 31/12/2019.