Accepted for Publication: January 14, 2015.
Published Online: May 4, 2015. doi:10.1001/jamapediatrics.2015.127.
Study concept and design: Petit, Tremblay, Montplaisir.
Acquisition, analysis, or interpretation of data: Petit, Pennestri, Paquet, Desautels, Zadra, Vitaro, Boivin, Montplaisir.
Drafting of the manuscript: Petit.
Critical revision of the manuscript for important intellectual content: Pennestri, Paquet, Desautels, Zadra, Vitaro, Tremblay, Boivin, Montplaisir.
Statistical analysis: Petit, Pennestri, Paquet, Vitaro.
Obtained funding: Zadra, Vitaro, Tremblay, Boivin.
Administrative, technical, or material support: Vitaro.
Study supervision: Zadra, Tremblay, Boivin, Montplaisir.
Conflict of Interest Disclosures: Dr Desautels reported receiving research grants from GlaxoSmithKline and Novartis Pharma as well as honoraria from speaking engagements from UCB and Paladin Labs. Dr Montplaisir reported receiving grants or support from Merck and GlaxoSmithKline; serving as an advisor for Sanofi, Servier, Merck, Jazz Pharmaceuticals, Valeant Pharmaceuticals, and Impax Laboratories; and receiving honoraria for speaking engagements from Valeant Pharmaceuticals and Otsuka Pharmaceutical. No other disclosures were reported.
Funding/Support: Funding was obtained from Quebec’s Department of Health and Social Services; the Canadian Institutes of Health Research; the Social Sciences and Humanities Research Council of Canada; the Quebec Fund for Research on Society and Culture; the Quebec Fund for Research on Nature and Technology; the Health Research Fund of Quebec; Quebec’s Ministry of Research, Science and Technology; Human Resources Development Canada; Health Canada; the University of Montreal; Laval University; and McGill University. This funding was obtained throughout the years for the Quebec Longitudinal Study of Child Development as a whole (design and data collection) but not for the specific purpose of the present study.
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Additional Contributions: We thank the children and families whose ongoing participation made this study possible. We also acknowledge the considerable contribution of the coordinators of the Quebec Longitudinal Study of Child Development and the Quebec Institute of Statistics. The contributors were not compensated.