Montreal Longitudinal and Experimental Study
The main objectives of this study are:
* to identify, from kindergarten, the predictors of adjustment problems among boys from low socioeconomic status families;
* to describe the development of behaviour problems from kindergarten to adulthood;
* to evaluate a program aimed at the prevention of the development of behaviour problems among boys from disadvantaged areas.
Overview
- Acronym
- MLES
- Website
- MLES
- Investigators
-
- Contacts
-
General Design
- Study design
- Cohort
- Start - End Year
- 1984 - 2006
- General Information on Follow Up (profile, frequency)
-
For the longitudinal group, after the first evaluation in kindergarten, evaluations were made starting at age 10. The children were assessed annually for behavior problems and delinquency from age 10 to 15 years, and substance use from age 13 to 17 years.These evaluations were made by parents, teachers, classmates, and the children themselves. For the experimental group, follow-up was done when participants were 11 and 12.
- Recruitment Target
-
- Individuals
- Number of Participants
- 1,037
Access
Availability of data and biosamples
| Possible Access to Data | |
| Possible Access to Biosamples | |
| Other |
Marker Paper
Tremblay RE, Vitaro F, Bertrand L, et al. Parent and child training to prevent early onset of delinquency: The Montréal longitudinal–experimental study. In J. McCord & R. E. Tremblay (Eds.), Preventing antisocial behavior: Interventions from birth through adolescence, 1992; 117–138
Timeline
Populations
MLES - Longitudinal group
The population is composed of Caucasian, Canadian-born kindergarten boys who are attending one of the 53 Montreal schools with lowest SES index, and whose parents are French-speaking and primarily low-income.
Selection Criteria
- Gender
-
Men only
- Minimum age
-
5
- Maximum age
-
6
- Countries
-
- Canada
- Canadian Provinces
-
- Quebec
- Territory
- Montreal, Quebec
- Ethnic Origin
-
- Caucasian
- Other Criteria
- Born from French-speaking Canadian parents who had less than 15 years of schooling and attended class in one of the 53 schools located in lower socioeconomic areas.
Sources of Recruitment
- Specific Population
-
- Other specific population : Kindergarten boys in 53 schools from low socioeconomic districts
Sample Size
- Number of Participants
- 1,037
Data Collection Events
MLES - Observational group
The population is composed of Caucasian, Canadian-born males who are attending one of the 53 Montreal schools with lowest SES index, and whose parents are French-speaking and primarily low-income. This population got disruptive behavior scores above the 70th percentile on the Social Behavior Questionnaire (SBQ).
Selection Criteria
- Gender
-
Men only
- Minimum age
-
7
- Maximum age
-
9
- Countries
-
- Canada
- Canadian Provinces
-
- Quebec
- Territory
- Montreal, Quebec
- Ethnic Origin
-
- Caucasian
- Other Criteria
- Born from French-speaking Canadian parents who had less than 15 years of schooling and attended class in one of the 54 schools located in lower socioeconomic areas.
Sources of Recruitment
- Specific Population
-
- Other specific population : Boys from one of 53 schools from low socioeconomic districts
Sample Size
- Number of Participants
- 82
Data Collection Events
| # | Name | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | MLES - Observational group - Year 1 |
|
1985 | 1985 | |
| 1 | MLES - Observational group - Year 2 |
|
1986 | 1986 | |
| 2 | MLES - Observational group - Year 3 |
|
1987 | 1987 | |
| 3 | MLES - Observational group - Year 4 |
|
1988 | 1988 | |
| 4 | MLES - Observational group - Year 5 |
|
1989 | 1989 | |
| 5 | MLES - Observational group - Year 6 |
|
1990 | 1990 | |
| 6 | MLES - Observational group - Year 7 |
|
1991 | 1991 | |
| 7 | MLES - Observational group - Year 8 |
|
1992 | 1992 | |
| 8 | MLES - Observational group - Year 9 |
|
1993 | 1993 |
MLES - Intervention group
The population is composed of Caucasian, Canadian-born males who are attending one of the 53 Montreal schools with lowest SES index, and whose parents are French-speaking and primarily low-income.This population got disruptive behavior scores above the 70th percentile on the Social Behavior Questionnaire (SBQ) and received training sessions with their parents.
Selection Criteria
- Gender
-
Men only
- Minimum age
-
7
- Maximum age
-
9
- Countries
-
- Canada
- Canadian Provinces
-
- Quebec
- Territory
- Montreal, Quebec
- Ethnic Origin
-
- Caucasian
- Other Criteria
- Born from French-speaking Canadian parents who had less than 15 years of schooling and attended class in one of the 53 schools located in lower socioeconomic areas.]
Sources of Recruitment
- Specific Population
-
- Other specific population : Boys attending one of the 53 schools from low socioeconomic districts
Sample Size
- Number of Participants
- 43
Data Collection Events
| # | Name | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | MLES - Intervention group - Pre-test |
|
1985 | 1985 | |
| 1 | MLES - Intervention group - Test |
|
1986 | 1986 | |
| 2 | MLES - Intervention group - Post-test |
|
1987 | 1988 | |
| 3 | MLES - Intervention group - Follow-up |
|
1989 | 1990 |
MLES - Control group
The population is composed of Caucasian, Canadian-born males who are attending one of the 53 Montreal schools with lowest SES index, and whose parents are French-speaking and primarily low-income. This population got disruptive behavior scores above the 70th percentile on the Social Behavior Questionnaire (SBQ).
Selection Criteria
- Gender
-
Men only
- Minimum age
-
7
- Maximum age
-
9
- Countries
-
- Canada
- Canadian Provinces
-
- Quebec
- Territory
- Montreal, Quebec
- Ethnic Origin
-
- Caucasian
- Other Criteria
- Born from French-speaking Canadian parents who had less than 15 years of schooling and attended class in one of the 53 schools located in lower socioeconomic areas.
Sources of Recruitment
- Specific Population
-
- Other specific population : Boys attending one of the 53 schools from low socioeconomic districts
Sample Size
- Number of Participants
- 41
Data Collection Events
| # | Name | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | MLES - Control group - Pre-test |
|
1985 | 1985 | |
| 1 | MLES - Control group - Test |
|
1986 | 1987 | |
| 2 | MLES - Control group - Post-test |
|
1987 | 1988 | |
| 3 | MLES - Control group - Follow-up |
|
1989 | 1990 |
Participating Studies
| Acronym | Name | Study design | Countries |
|---|
Harmonization Initiatives Included
| Acronym | Name |
|---|
Datasets
| Name | Data Collection Events | Variables |
|---|
Areas of Information Collected
- Socio-demographic and economic characteristics
- Death
- Lifestyle and behaviours
- Physical measures and assessments
- Birth, pregnancy and reproductive health history
- Laboratory measures
- Perception of health, quality of life, development and functional limitations
- Cognition, personality and psychological measures and assessments
- Diseases
- Life events, life plans, beliefs and values
- Symptoms and signs
- Preschool, school and work life
- Medication and supplements
- Social environment and relationships
- Non-pharmacological interventions
- Physical environment
- Health and community care services utilization
- Administrative information
Variables Content Summary
Areas of Information Collected
No Areas of Information Collected
No Scales Collected
Areas of Information Collected per per Population and Data Collection Event
No Areas of Information Collected
No Scales Collected
Networks
| Acronym | Name | Harmonization Initiatives | Individual Studies |
|---|
Last Update: 2023-08-10T18:18:25.696