Longitudinal weight status and academic achievement in elementary schoolchildren in the United States.

"Competing interests The authors declare no competing interests."

"This study was made possible by a grant from the Robert Wood Johnson Foundation (ID: 74281) and the Ardmore Institute of Health. Additional thanks go to Blessing Falade, Cassandra Bryan, Jessica Kelleher, Chuck Truett, the physical activity specialists from HealthMPowers, members of the study’s advisory board, and participating school district administrators."

"Data used to answer the research questions are from a cluster-randomized controlled trial conducted in 40 elementary schools (20 intervention schools; 20 control schools) in a large suburban school district in Georgia, US. Students were prospectively followed from Grade 4 to Grade 5 including Grade 4 Fall (Fall 2018), Grade 4 Spring (Spring 2019), Grade 5 Fall (Fall 2019), and Grade 5 Spring (Spring 2020), though study activities ended midway through Grade 5 Spring in March 2020 because of the COVID-19 pandemic. School selection and randomization are described in a previous manuscript []. The school district administration, district IRB, and Emory University IRB (CR001-IRB00095600) approved this study. This study was registered with the National Institutes of Health ClinicalTrials.gov system, with ID NCT03765047."