General objectives:

  1. To determine the extent of co-occurrence of modifiable lifestyle behaviors among youth along the life course. The behaviors of interest include cigarette use, cannabis use, heavy alcohol use, high junk food consumption, low healthy food consumption, physical inactivity, sedentary behaviour.
  2. To examine the natural course of co-occurrence of youths’ modifiable lifestyle behaviors.
  3. To identify sub-groups of youth based on developmental trajectories of the co-occurrence of their modifiable lifestyle behaviors.
  4. To evaluate which contextual layers of the environment, including family, peers, school, neighborhood, and society, shape the evolution, maintenance, and escalation of youths’ modifiable lifestyle behaviors, and when during the life course they exert their maximal influence.
  5. To examine possible determinants of the co-occurrence of youths’ modifiable lifestyle behaviours, including sociodemographic factors, psychosocial factors, and pubertal stage.

Study Design

Study Design Cohort
Recruitment Target
  • Individuals
Number of Participants


Supplementary Information

In addition we collected administrative data from 28 of the 29 study schools as well as parental data from 1435 out of the 1843 participants.


Not Applicable
Don't know
Possible Access to Data

Possible Access to Biosamples


Marker Paper

O'Loughlin EK, Dugas EN, Sabiston CM, O'Loughlin JL. Prevalence and correlates of exergaming in youth. Pediatrics. 2012 Nov;130(5):806-14.

PUBMED 23027171

Supplementary Information

The AdoQuest study welcomes students and researchers to apply to use the data for conference presentations and manuscript publication. Please contact Erin O'Loughlin for application details.


Study Timeline

Each colour in the timeline graph below represents a separate Study Population, while each segment in the graph represents a separate Data Collection Event. Clicking on a segment gives more detailed information on a Data Collection Event.


AdoQuest study population

The sample was drawn from among all French-language schools with more than 90 grade 5 students, located in the greater Montreal area. To assure equal representation of students by socioeconomic status (SES), all schools in the target territory were stratified by a continuous SES indicator and 9-10 schools were randomly selected from within each of the upper (n=10), middle (n=10) and lower school (n=9) SES tertile. Participants were recruited from all grade 5 classes in each of the 29 participating schools.

Selection Criteria

Age Minimum age 10, Maximum age 12
Country Canada

Québec (Laval, Lanaudière, Laurentides, Montérégie)

Supplementary Information

Participants were recruited from French-speaking schools only.

Data Collection Events

Survey 1

Data were collected in self-report...

Survey 2

Data were collected in self-report...

Survey 3

Data were collected in self-report...

Survey 4

Data were collected in self-report...

Survey 5

Data were collected in self-report...

Survey 6

Data were collected in self-report...


Variable Classification