Author Contributions: Dr Herbert had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Herbert, Latimer, Curtin, Monagle, Broderick.
Acquisition of data: Herbert, Latimer, Mathieu, Broderick.
Analysis and interpretation of data: Herbert, Latimer, Broderick.
Drafting of the manuscript: Herbert, Latimer, Broderick.
Critical revision of the manuscript for important intellectual content: Herbert, Latimer, Barnes, Curtin, Mathieu, Monagle, Brown, Broderick.
Statistical analysis: Herbert, Broderick.
Obtained funding: Herbert, Barnes, Latimer, Monagle, Broderick.
Administrative, technical, or material support: Barnes, Curtin, Mathieu, Monagle, Brown, Broderick.
Study supervision: Herbert, Latimer, Broderick.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Drs Broderick, Herbert, Latimer, and Curtin reported that they have previously received a competitive research grant from the Bayer Hemophilia Awards Program. Dr Barnes reported receiving speaker fees from NovoNordisk, Bayer, Baxter Health Care, and CSL-Behring. He has also received consultant fees from NovoNordisk and BaxterHealthCare. Dr Curtin reported that she is a paid consultant of the Novo Nordisk Hemophilia Advisory Board and has received research support from CSL. She has also received conference travel support from Baxter and Pfizer. Dr Brown has previously received an honorarium from Novo Nordisk.
Funding Support: This study was supported by a project grant from the National Health and Medical Research Council (NHMRC). Dr Herbert is supported by a research fellowship from the Australian NHMRC, and Dr Latimer is supported by a Future Fellowship from the Australian Research Council.
Role of the Sponsor: The funding body had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: We thank the children, adolescents, and families who participated in this study and the hemophilia nurses and physiotherapists at the 3 recruiting sites: Robyn Shoemark, DipAccSc, nursing, the Children’s Hospital at Westmead; Janine Furmedge, BSc, Royal Children’s Hospital, Melbourne; and Salena Griffin, BN, and Wendy Poulsen, BPhty, Royal Children’s Hospital, Brisbane. We thank Stephane Heitier, PhD, Qiang Li, MBiostat BPh, and Laurent Billot, MSc, from the George Institute for Global Health for statistical support. No compensation was given.