Quebec Longitudinal Study of Kindergarten Children
Networks
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Datasets
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Variables
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The study examined the prevalence of behaviour problems during the elementary school years using a developmental perspective.
Four major aims were defined:
- to describe the different developmental trajectories among children from their entry into kindergarten to their entry into the work force;
- to identify the factors that enable us to recognize, from kindergarten, those children who are at risk of developing adjustment problems over the course of their schooling education;
- to identify the protective factors that will enable children to succeed in school and to adapt well socially, in spite of unfavorable elements in their environment;
- to contribute to the knowledge necessary for the development of programs adapted to high risk children.
- Start Year
- 1986
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Design
- Study design
- Cohort
- Follow Up
- To date, 12 data collections have been conducted over 24 years (1986–2010), and three generations of participants have been involved in the study (i.e. the study child, his parents and the study child’s first child). Data on the participants were obtained via teacher reports yearly from age 6–12 years; via parent reports from age 6–19 years; and via the participants themselves at age 13–29 years. Finally, data on the study child’s first child were obtained via paper or web-based questionnaires rated by the participant (now a parent).
Marker Paper
Rouquette A, Cote SM, Pryor LE, et al. Cohort Profile: The Quebec Longitudinal Study of Kindergarten Children (QLSKC). International Journal of Epidemiology, 2012; 43(1), 23-33.
PUBMED 23159828
Recruitment
- Recruitment Target
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- Individuals
Number of Participants
- Number of Participants
- 3,017
- Number of Participants with Biological Samples
- 3,017
Access
Availability of data and biosamples
| Possible Access to Data | |
| Possible Access to Biosamples | |
| Other |
Timeline
QLSKC population
The population consisted of kindergarten boys and girls attending French-speaking public schools in the Canadian province of Quebec during the 1986-87 and 1987-88 school years. Two thousand children representative of the population and 1017 children exhibiting disruptive behaviour problems were included in the cohort.
Selection Criteria
- Minimum age
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6
- Newborns
- Twins
- Countries
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- Canada
- Territory
- Ethnic Origin
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- Health Status
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- Other Criteria
- Attending French-speaking public schools
Recruitment
- Sources of recruitment
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- General population
- General Population
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- Selected sample
- Supplementary Information
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2000 (1001 boys) of the subjects were chosen randomly and proportionally according to the 11 administrative regions of Québec, to create a representative sample of the children who attended kindergarten in a francophone public school in the province of Quebec in the 1986-87 and 1987-88 school years. The remaining 1017 children (593 boys) scored at or above the 80th percentile for disruptive behaviors at the end of kindergarten (age 6 years) with gender-specific cut-offs.
Number of Participants
- Number of Participants
- 3,017
- Number of Participants with Biological Samples
- 3,017
Data Collection Events
| # | Name | Description | Start | End |
|---|---|---|---|---|
| 0 |
QLSKC - Kindergarten
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Data on the participants were obtained via teacher and parent reports yearly from age 6 to 8 years. Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by ... | 1986 | 1988 |
| 1 |
QLSKC - Grade 1
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Data on the participants were obtained via teacher and parent reports yearly from age 6 to 8 years. Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by ... | 1987 | 1989 |
| 2 |
QLSKC - Grade 2
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Data on the participants were obtained via teacher and parent reports yearly from age 6 to 8 years. Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by ... | 1988 | 1990 |
| 3 |
QLSKC - Grade 3
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Data on the participants were obtained via teacher and parent reports yearly from age 6 to 8 years. Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by ... | 1989 | 1991 |
| 4 |
QLSKC - Grade 4
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Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by both teacher and parent to assess the behaviour of the child. The emotional climate for the child and ... | 1990 | 1992 |
| 5 |
QLSKC - Grade 5
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Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by both teacher and parent to assess the behaviour of the child. The emotional climate for the child and ... | 1991 | 1993 |
| 6 |
QLSKC - Grade 6
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Self-administered questionnaires, such as The Social Behaviour Questionnaire were completed by both teacher and parent to assess the behaviour of the child. The emotional climate for the child and ... | 1992 | 1994 |
| 7 |
QLSKC - Grade 7
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At age 13 years (grade 7), adolescents who attended a school where there were at least six other study participants were invited to self-report their delinquent behaviours via paper and pencil ... | 1993 | 1995 |
| 8 |
QLSKC - 15 to 17 years
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The Self-Rating Questionnaire collected information about socio-demographics, school environment and progress, activities and jobs, general health, alcohol and drug use, delinquency and legal ... |
1995 | 1997 |
| 9 |
QLSKC - 19 to 21 years
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When the participants were 19 years old, information on the familial determinants of the young adults’ psychosocial adjustment (activities, feelings, relationships and behaviours) was ... |
1999 | 2002 |
| 10 |
QLSKC - 22 to 24 years
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The Self-Rating Questionnaire collected information about socio-demographics, school environment and progress, activities and jobs, general health, alcohol and drug use, delinquency and legal ... |
2001 | 2004 |
| 11 |
QLSKC - 29 to 31 years
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At age 29 years, data concerning gambling practices and the main dimensions previously assessed were collected on a subsample of subjects who had complete data from the 15 or 22 years waves. ... |
2008 | 2010 |
Classifications
- Socio-demographic and economic characteristics
- Lifestyle and behaviours
- Birth, pregnancy and reproductive health history
- Perception of health, quality of life, development and functional limitations
- Diseases
- Symptoms and signs
- Medication and supplements
- Non-pharmacological interventions
- Health and community care services utilization
- Death
- Physical measures and assessments
- Laboratory measures
- Cognition, personality and psychological measures and assessments
- Life events, life plans, beliefs and values
- Preschool, school and work life
- Social environment and relationships
- Physical environment
- Administrative information
- Cognitive functioning
- Personality
- Psychological distress and emotions
- Other psychological measures and assessments
- Tobacco
- Alcohol
- Drugs
- Nutrition
- Breastfeeding
- Physical activity
- Sleep
- Sexual behaviours and orientation
- Technological devices
- Misbehaviour and criminality
- Other and unspecified lifestyle information
Socio-demographic and economic characteristics
Age/birthdate
Sex/gender
Marital/partner status
Family and household structure
Education
Residence
Birthplace
Citizenship and immigrant status
Ethnicity, race and religion
Language
Labour force and retirement
Income, possessions, and benefits
Other socio-demographic and economic characteristics
Lifestyle and behaviours
Tobacco
Alcohol
Drugs
Nutrition
Breastfeeding
Physical activity
Transportation
Sleep
Sexual behaviours and orientation
Leisure activities
Technological devices
Misbehaviour and criminality
Other and unspecified lifestyle information
Birth, pregnancy and reproductive health history
Puberty, menstruation, menopause and andropause
Contraception
Pregnancy, delivery and birth
Perception of health, quality of life, development and functional limitations
Perception of health
Quality of life
Life course development
Functional limitations
Use of assistive devices
Other perception of health, quality of life and functional limitation-related information
Diseases
Certain infectious and parasitic diseases (A00-B99)
Neoplasms (C00-D48)
Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
Endocrine, nutritional and metabolic diseases (E00-E90)
Mental and behavioural disorders (F00-F99)
Diseases of the nervous system (G00-G99)
Diseases of the eye and adnexa (H00-H59)
Diseases of the circulatory system (I00-I99)
Diseases of the respiratory system (J00-J99)
Diseases of the digestive system (K00-K93)
Diseases of the skin and subcutaneous tissue (L00-L99)
Diseases of the musculoskeletal system and connective tissue (M00-M99)
Diseases of the genitourinary system (N00-N99)
Injury, poisoning and certain other consequences of external causes (S00-T98)
External causes of morbidity and mortality (V01-Y98)
Diseases without precise specification or falling into multiple categories
Symptoms and signs
Symptoms and signs involving the circulatory and respiratory systems (R00-R09)
Symptoms and signs involving the digestive system and abdomen (R10-R19)
Symptoms and signs involving the skin and subcutaneous tissue (R20-R23)
Symptoms and signs involving nervous and musculoskeletal systems (R25-R29)
Symptoms and signs involving cognition, perception, emotional state and behaviour (R40-R46)
General symptoms and signs (R50-R69)
Symptoms related to multiple categories
Medication and supplements
Medication and supplement intake
Posology and protocol of administration
Non-pharmacological interventions
Surgical interventions
Cognitive, psychological and sensory interventions
Other and unspecified non-pharmacological interventions
Health and community care services utilization
Visits to health professionals
Hospitalizations
Community and social care
Other health and community care
Death
Vital status
Cause of death
Physical measures and assessments
Physical characteristics
Anthropometry
Laboratory measures
Genomics
Cognition, personality and psychological measures and assessments
Cognitive functioning
Personality
Psychological distress and emotions
Other psychological measures and assessments
Life events, life plans, beliefs and values
Life events
Life plans
Beliefs and values
Preschool, school and work life
Preschool life
School life
Work life
Other preschool, school or work life-related information
Social environment and relationships
Social network
Social participation
Social support
Parenting and familial environment
Other social environment characteristics
Physical environment
Housing characteristics
Built environment/neighbourhood characteristics
Chemical exposure
Administrative information
Date and time-related information
Questionnaire and interview-related information
Personality
Adult Attachment Scale
Dimensions of Temperament Survey
Social Behaviour Questionnaire
Self-Description Questionnaire (Physical Abilities)
Self-Description Questionnaire (Physical Appearance)
Self-Description Questionnaire (Emotional Stability)
Self-Description Questionnaire (Self-esteem)
Self-Description Questionnaire (Honesty and Trust)
Self-Description Questionnaire (Mathematics Scale)
Self-Description Questionnaire (Parents Relations)
Self-Description Questionnaire (Peer Relations)
Self-Description Questionnaire (General-School)
Self-Description Questionnaire (Verbal Self-concept)
Ways of Coping Questionnaire
Psychological distress and emotions
Children's Depression Inventory
Diagnostic Interview Schedule for Children
Misbehaviour and criminality
South Oaks Gambling Screen
Other and unspecified lifestyle information
Personal Experience Screening Questionnaire