Ethics approval and consent to participate
Pennington Biomedical Institutional Review Board approved this study (#2017-040-PBRC and #2017-034-PBRC ) and written informed consent was provided by all participants, parents or legal guardians. This study was prospectively registered through clinicaltrials.gov (NIH National Library of Medicine) on 21/03/2019 for i27ndividual child-level assessments (identifier: NCT03885518) and 26/03/2019 for playground observations (identifier: NCT03890913). All methods were carried out in accordance with relevant guidelines and regulations.