From the ∗School of Health Sciences, Faculty of Medicine and Health, The University of Sydney

†Children's Hospital at Westmead, Sydney

‡Priority Research Centre for Physical Activity and Nutrition, College of Health, Medicine and Wellbeing, The University of Newcastle, Newcastle, Australia.

The authors declare that no financial support has been received for the completion of this study. There was also no conflict of interest encountered in the completion of this study. The 1000 Norms Project was supported by grants from the National Health and Medical Research Council of Australia Centre for Research Excellence in Neuromuscular Disorders (NHMRC 1031893) and the Australian Podiatry Education and Research Foundation. M.S. is supported by the Sydney Research Accelerator fellowship.

Author contributions: J.H.O. contributed to the study design, data extraction, analysis and interpretation, and drafting of manuscript. M.S. contributed to the study design, analysis and interpretation, revising, and approval of final manuscript. J.E. contributed to the study design, data extraction, revising, and approval of final manuscript. J.B. contributed to the study conceptualization and design, provision of data, revising, and approval of final manuscript. J.N.B. contributed to the data collection, revising, and approval of final manuscript. M.J.M. contributed to the study design, analysis and interpretation, data collection, revising, and approval of final manuscript.

Correspondence: Jia Hui Ong, BAppSc (Phty), Discipline of Physiotherapy, School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Susan Wakil Health Building, Western Avenue, Camperdown, New South Wales, 2006. E-mail: [email protected].

Supplemental digital content is available for this article. Direct URL citation appears in the printed text and is provided in the HTML and PDF versions of this article on the journal’s Web site (www.jclinrheum.com).