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Results of original analyses on the relationship between school entry age and ADHD diagnoses for Quebec children


Tuesday 25 Apr 2023
From 4PM To 6PM

In Quebec, children must be 5 years old before October 1st to be admitted to kindergarten. In the same class, the youngest children are therefore up to one year younger than the oldest. In a CIRANO study, the authors show that children born in September have 35% higher rates of ADHD diagnosis and medication than those born in October. ADHD is believed to be confused with inattentive or more unruly behaviours.

During this roundtable, Catherine Haeck, ESG-UQAM Full professor, Fellow and Principal Researcher of the CIRANO Skills theme, Pierre Lefebvre, ESG-UQAM Associate professor and Philip Merrigan, ESG-UQAM Professor, CIRANO Researcher and Fellow, will present the results from their recently published CIRANO study. Marie-Christine Brault, Professor at UQAC and Chair of the Canada Research Chair in Children, Medicine and Society, and Isabelle Boisvert, scientific coordinator at the Institut national d'excellence en santé et en services sociaux, will enrich the discussions by presenting research findings and recommendations on ADHD.

The event will end with a discussion between the specialists and the participants and a cocktail reception.


The event will be held in French. 

Registration is free but mandatory.

Boisvert, Isabelle
Scientific coordinator, Institut national d'excellence en santé et en services sociaux (INESSS)
Brault, Marie-Christine
Professor, Université du Québec à Chicoutimi (UQAC)
Chairholder, Chaire de recherche du Canada en enfances, médecine et société
Haeck, Catherine
CIRANO Researcher and Fellow
Full Professor, École des sciences de la gestion de l’Université du Québec à Montréal (ESG-UQAM)
Ph.D., Economics, Katholieke Universiteit Leuven
Lefebvre, Geneviève
Full Professor, Université du Québec à Montréal (UQAM)
Lefebvre, Pierre
Associate Professor, ESG-UQAM
Merrigan, Philip
CIRANO Researcher and Fellow
Professor, Université du Québec à Montréal (UQAM)
Ph.D., Economics, Université de Montréal


16:00 - 16:10
A word of welcome
16:10 - 16:30
Presentation of the results of the CIRANO Report on the Effect of Month and Year of Birth on ADHD Diagnosis and Medication in Quebec
Catherine Haeck, Philip Merrigan, Pierre Lefebvre
16:30 - 16:40
Overview of the main findings of ADHD research
Marie-Christine Brault
16:40 - 16:50
INESSS' findings and recommendations
Isabelle Boisvert
16:50 - 17:15
Round table discussion and exchanges
17:15 - 18:00


1130 Rue Sherbrooke Ouest, Montréal, QC H3A 2M8, Canada

Registration form

  The registration period for the event is over.