Quebec Longitudinal Study of Child Development

Overview

Acronym
QLSCD
Website
QLSCD
Investigators
  • Dr. Jean Séguin

    Université de Montréal

  • Dr. Amélie Quesnel-Vallée

    McGill University

  • Dr. Tamarha Pierce

    Université Laval

  • Dr. Frank Vitaro

    Université de Montréal

  • Dr. Véronique Dupéré

    Université de Montréal

  • Dr. Élise Ledoux

    Institut de recherche Robert-Sauvé en santé et en sécurité du travail, Université du Québec à Montréal

  • Dr. Bertrand Perron

    Institut de la statistique du Québec

  • Dr. Simon Larose

    Université Laval

  • Dr. Richard E. Tremblay

    Université de Montréal

  • Dr. Michel Boivin

    Université Laval

  • Dr. Lise Dubois

    University of Ottawa

  • Dr. Marie-Claude Geoffroy

    Mcgill University

Contacts
  • Nancy Illick

    Institut de la statistique du Québec

General Design

Study design
Cohort
Start Year
1998
General Information on Follow Up (profile, frequency)

Yearly follow-up from 5 months to about 25 years of age, with breaks at ages 9, 11, 14, 16, 18, 20, 22, and 24.

Recruitment Target
  • Individuals
Number of Participants
2,120
Number of Participants with Biological Samples
1,000
Supplementary information about number of participants
Other biological samples were collected when the participants were 17 years old.

Access

Availability of data and biosamples

Possible Access to Data
Possible Access to Biosamples
Other

Sector of research

Possible Access to Data Possible Access to Biosamples
Investigators from the public sector
Investigators from the private sector
Investigators from not-for-profit organization

Transfer

Possible Access to Data Possible Access to Biosamples
Can leave the study facility
Can leave the country

Cost

Possible Access to Data No Cost
Possible Access to Biosamples Variable Cost

Cost reduction for co-analyses

Possible Access to Data
Possible Access to Biosamples

Supplementary Information

Questionnaires available here

Timeline

Population

QLSCD population

Selection Criteria

Newborns
Countries
  • Canada
Territory
Quebec
Health Status
  • Some children were excluded because of constraints linked to the sample frame or major health problems, such as premature babies whose gestation lasted less than 24 weeks or more than 42 weeks and babies whose sex was unknown at participant selection.

Other Criteria

Mothers living in the sociosanitary areas 10 (North-of-Quebec), 17 (Cree territory) and 18 (Inuit territory) and mothers living on Indian reserves were excluded.

Minimum age: 59 gestational weeks at the beginning of each collection period at time 1

Maximum age: 60 gestational weeks at the beginning of each collection period at time 1

Sources of Recruitment

General Population
  • Selected sample

Sample Size

Number of Participants
2,120
Number of Participants with Biological Samples
1,000
Supplementary Information

Data collection 1998: 2120 participants

Data collection 1999: 2045 participants

Data collection 2000: 1997 participants

Data collection 2001: 1950 participants

Data collection 2002: 1944 participants

Nutrition Data collection 2002: 1550 participants

Data collection 2003: 1776 participants

Data collection 2004: 1529 participants

Psychomotricity Data collection 2004: 1529 participants

Data collection 2005: 1537 participants

Data collection 2006: 1526 participants

Psychomotricity Data collection 2006: 1526 participants

Data collection 2008: 1402 participants

Health Data collection 2008-2009: 1000 participants

Data collection 2010: 1415 participants

Data collection 2011: 1312 participants

Data collection 2013: 1466 participants

Data collection 2015: 1348 participants

Data collection 2017: 1401 participants

Mental Health Data collection 2018: 1245 participants

Data collection 2019: 1323 participants

Data Collection Events

# Name Description Start End
0 QLSCD - Data collection 1998 1998 (March) 1998 (December)
1 QLSCD - Data collection 1999 1999 (March) 1999 (December)
2 QLSCD - Data collection 2000 2000 (March) 2000 (November)
3 QLSCD - Data collection 2001 2001 (March) 2001 (November)
4 QLSCD - Data collection 2002 2002 (March) 2002 (June)
5 QLSCD - Nutrition Data collection 2002 2002 (March) 2002 (July)
6 QLSCD - Data collection 2003 2003 (March) 2003 (June)
7 QLSCD - Data collection 2004 2004 (March) 2004 (June)
8 QLSCD - Psychomotricity Data collection 2004 2004 (March) 2004 (August)
9 QLSCD - Data collection 2005 2005 (March) 2005 (June)
10 QLSCD - Psychomotricity Data collection 2006 2006 (March) 2006 (June)
11 QLSCD - Data collection 2006 2006 (March) 2006 (June)
12 QLSCD - Data collection 2008 2008 (February) 2008 (June)
13 QLSCD - Health Data collection 2008-2009 2008 (March) 2009 (March)
14 QLSCD - Data collection 2010 2010 (February) 2010 (June)
15 QLSCD - Data collection 2011 2011 (February) 2011 (June)
16 QLSCD - Data collection 2013 2013 (February) 2013 (June)
17 QLSCD - Data collection 2015 2015 (February) 2015 (June)
18 QLSCD - Biological Embedding of Childhood Adversity Data collection 2015 2015 (February) 2015 (May)
19 QLSCD - Data collection 2017 2017 (February) 2017 (May)
21 QLSCD - Mental health Data collection 2018 2018 (March) 2018 (June)
21 QLSCD - Data collection 2019 2019 (February) 2019 (June)

Individual Studies Included

Acronym Name Study design Participants Countries

Harmonization Projects Included

Acronym Name

Networks

Acronym Name Studies

Datasets

Name Type Data Collection Events Variables
Last Update: 2021-05-05 22:11