Author Contributions: Drs Ekelund and Luan had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Ekelund, Sherar, Cooper.
Acquisition of data: Ekelund, Sherar, Griew.
Analysis and interpretation of data: Ekelund, Luan, Esliger, Cooper.
Drafting of the manuscript: Ekelund, Cooper.
Critical revision of the manuscript for important intellectual content: Ekelund, Luan, Sherar, Esliger, Griew, Cooper.
Statistical analysis: Ekelund, Luan.
Obtained funding: Ekelund, Cooper.
Administrative, technical, or material support: Sherar, Esliger, Griew.
Study supervision: Ekelund.
Dr Esliger developed the program for accelerometer data reduction and analyses, assisted with data cleaning and reduction, and contributed to interpretation of the data; and Ms Griew organized the phenotypic information.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Ekelund, Ms Griew, and Dr Cooper report receipt of an institutional grant from National Prevention Research Initiative, UK (NPRI-UK). Dr Ekelund reports institutional support for travel to meetings for the study or other purposes from NPRI-UK. Dr Esliger reports being the founder of Esliger Consulting, which produces KineSoft, the analytical software used to generate the accelerometry outcome variables in this study. No other disclosures were reported.
Funding/Support: Funding for the project was provided by the NPRI-UK. Funding partners: British Heart Foundation; Cancer Research UK; Department of Health; Diabetes UK; Economic and Social Research Council; Medical Research Council; Research and Development Office for the Northern Ireland Health and Social Services; Chief Scientist Office, Scottish Executive Health Department; The Stroke Association; Welsh Assembly Government; and World Cancer Research Fund.
Role of the Sponsors: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Contributors of data to the International Children's Accelerometry Database (ICAD): A. Ness, MD, Avon Longitudinal Study of Parents and Children (ALSPAC), School of Oral and Dental Sciences, University of Bristol, UK; J. J. Puder, MD, Ballabeina Study, Service of Endocrinology, Diabetes and Metabolism, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland; G. Cardon, PhD, Belgium Pre-School Study, Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium; R. Davey, PhD, Children's Health and Activity Monitoring for Schools (CHAMPS), Centre for Research and Action in Public Health, University of Canberra, Canberra, Australia; R. Pate, PhD, Physical Activity in Pre-school Children and Project Trial of Activity for Adolescent Girls (Project TAAG), Department of Exercise Science, University of South Carolina, Columbia; J. Salmon, PhD; Children Living in Active Neigbourhoods (CLAN) and Healthy Eating and Play Study (HEAPS), School of Exercise and Nutrition Sciences, Deakin University, Melbourne, Australia; L. B. Andersen, PhD, Copenhagen School Child Intervention Study (CoSCIS), University of Southern Denmark, Odense, Denmark; K. Froberg, PhD, European Youth Heart Study (EYHS), Denmark, University of Southern Denmark, Odense, Denmark; L. B. Sardinha, PhD, European Youth Heart Study (EYHS), Portugal, Exercise and Health Laboratory, Faculty of Human Movement, Technical University of Lisbon, Lisbon, Portugal; S. A. Anderssen, PhD, European Youth Heart Study (EYHS), Norway, Norwegian School for Sport Science, Oslo, Norway; K. F. Janz, PhD, Iowa Bone Development Study, Department of Health and Sports Studies, Department of Epidemiology, University of Iowa, Iowa City; S. Kriemler, MD, Kinder-Sportstudie (KISS), Swiss Tropical and Public Health Institute, University of Basel, Basel, Switzerland; J. Reilly, MD, Movement and Activity Glasgow Intervention in Children (MAGIC), Division of Developmental Medicine, University of Glasgow, Glasgow, UK; Centers for Disease Control and Prevention (CDC), National Center for Health Statistics (NCHS), Hyattsville, MD, National Health and Nutrition Examination Survey (NHANES, 2003/2004; 2005/2006); A. Cooper, PhD, Personal and Environmental Associations with Children's Health (PEACH), Centre for Exercise, Nutrition and Health Sciences, University of Bristol, Bristol, UK; P. Hallal, PhD, 1993 Pelotas Birth Cohort, Postgraduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil; S. Griffin, MD, Sport, Physical Activity and Eating Behavior: Environmental Determinants in Young People (SPEEDY) Study, Medical Research Council Epidemiology Unit, Cambridge, UK.
Online-Only Material: The Author Audio Interview is
Additional Contributions: We are also extremely grateful to Chris Riddoch, PhD, and Ken Judge, PhD, University of Bath, Bath, United Kingdom, for their invaluable contribution to the ICAD. No compensation was received for the contribution of data to the ICAD.
This article was corrected for errors on March 6, 2012.