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Cohort Profile: Quebec Longitudinal Study of Child Development (QLSCD)

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Social Psychiatry and Psychiatric Epidemiology Aims and scope Submit manuscript

Abstract

Purpose

The Quebec Longitudinal Study of Child Development (QLSCD) was designed to examine the long-term associations of preschool physical, cognitive, social, and emotional development with biopsychosocial development across childhood, adolescence, and young adulthood.

Methods

QLSCD is an ongoing prospective cohort including 2120 singletons born in 1997/1998 in the Canadian province of Quebec. So far, data have been collected annually or every 2 years from child ages 5 months to 21 years. The cohort currently includes 1245 participants. Data available include a range of environmental (e.g., family characteristics, child behaviour, educational attainment, mental health), biological (e.g., hair cortisol, genetic, epigenetic), and administrative data.

Results

QLSCD has contributed to the understanding of children’s psychosocial development, including the development of physical aggression and anxiety. QLSCD articles have advanced scientific knowledge on the influence of early childhood factors on childhood, adolescent, and young adult mental health, including the effect of participation in early childcare on cognitive and behavioural development, the developmental origins of adolescent and young adult mental health problems and suicide risk, and the development of interpersonal difficulties (e.g., peer victimisation) from preschool years to adolescence.

Conclusion

QLSCD has given major contributions to our understanding of the link between different aspects of child development and biopsychosocial development during the first two decades of life. Unique features include the presence of environmental, biological, and administrative data, long-term follow-up with frequent data collections, and use of data from multiple informants, including teachers, mothers, fathers, and the children themselves.

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Acknowledgement

For more than 20 years, the Quebec Longitudinal Study of Child Development (QLSCD) has relied on the relentless effort and contributions of many professionals and scholars from the Quebec government and universities. Special thanks to Christine Collin, Aline Émond, Daniel Tremblay, and Marc Renaud who believed in the project and helped provide the initial funding, to Mireille Jetté, Bertrand Perron, Nancy Illick, Hélène Desrosiers, and their teams at the Institut de la Statistique du Québec (ISQ) who led the QLSCD data collection over the years, to Lyse Desmarais and her team at GRIP who coordinated the QLSCD grants and the interface with ISQ, and to the many scientists who generously gave their time and expertise to guide the longitudinal assessments; among the many, we wish to thank Lise Dubois, Jacques Montplaisir, Dominique Petit, Jean Séguin, Christa Japel, Mark Zoccolillo, Ginette Dionne, Frank Vitaro, Mara Brendgen, Jean-Philippe Gouin, Gustavo Turecki, and Simon Larose. Many thanks also to Qian Xu, who serves as the main data analyst at the GRIP. Finally, we are deeply grateful to the participating parents, children, and teachers who make this unique endeavour possible.

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Author notes

  1. Richard E. Tremblay and Sylvana M. Côté Joint senior authors.

Authors and Affiliations

  1. McGill Group for Suicide Studies, Department of Psychiatry, Department, Montreal, Douglas Mental Health University Institute, McGill University, Frank B. Common Pavilion, F-2101 6875 LaSalle Boulevard, Montreal, QC, H4H 1R3, Canada

    Massimiliano Orri & Marie-Claude Geoffroy

  2. Bordeaux Population Health Research Centre, Inserm U1219, University of Bordeaux, Bordeaux, France

    Massimiliano Orri & Sylvana M. Côté

  3. School of Psychology, Université Laval, Quebec, QC, Canada

    Michel Boivin

  4. Sainte-Justine Hospital Research Center, Montreal, QC, Canada

    Chelsea Chen & Marilyn N. Ahun

  5. Department of Social and Preventive Medicine, School of Public Health, University of Montreal, 3050 Edouard Montpetit, Montreal, QC, H3T 1J7, Canada

    Marilyn N. Ahun & Sylvana M. Côté

  6. Department of Education and Counselling Psychology, McGill University, Montreal, QC, Canada

    Marie-Claude Geoffroy

  7. School of Criminology, University of Montreal, Montreal, QC, Canada

    Isabelle Ouellet-Morin

  8. Research Center of the Montreal Mental Health University Institute, Montreal, QC, Canada

    Isabelle Ouellet-Morin

  9. Department of Pediatrics and Psychology, University of Montreal, Montreal, QC, Canada

    Richard E. Tremblay

  10. School of Public Health, University College Dublin, Dublin, Ireland

    Richard E. Tremblay

Authors
  1. Massimiliano Orri
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  2. Michel Boivin
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  3. Chelsea Chen
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  4. Marilyn N. Ahun
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  5. Marie-Claude Geoffroy
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  6. Isabelle Ouellet-Morin
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  7. Richard E. Tremblay
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  8. Sylvana M. Côté
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Contributions

MO, CC, and MNA wrote the initial draft; all authors revised and commented the draft for important intellectual contributions, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.

Corresponding author

Correspondence to Sylvana M. Côté.

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Orri, M., Boivin, M., Chen, C. et al. Cohort Profile: Quebec Longitudinal Study of Child Development (QLSCD). Soc Psychiatry Psychiatr Epidemiol 56, 883–894 (2021). https://doi.org/10.1007/s00127-020-01972-z

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