Effect of COVID-19 Pandemic Lockdowns on Body Mass Index of Primary School Children from Different Socioeconomic Backgrounds.

"the r code used to process and analyze the data is available in the open science framework (osf) repository https://osf io/bc4uj/ . availability of data and materials the datasets analyzed in this study can be requested from till utesch. the r code used to process and analyze the data is available in the open science framework"

"the r code used to process and analyze the data is available in the open science framework (osf) repository https://osf io/bc4uj/ ."

"Declarations Ethics Approval and Consent to ParticipateThe study and the consent forms signed by the subjects were approved by the Senate of Berlin before the study started in 2012. The study was conducted in accordance with the Declaration of Helsinki. Consent for PublicationNot applicable. Competing InterestsLP, RS, JZ, DB, KG, and TU declare that they have no conflict of interest. Competing Interests LP, RS, JZ, DB, KG, and TU declare that they have no conflict of interest."

"Funding Open Access funding enabled and organized by Projekt DEAL. This research is part of the PESCov project (‘Physical Education, Sport, and Corona-Virus Pandemic: Understanding consequences of COVID-19 pandemic lockdowns on children’s and youth physical literacy’) that was funded by the German Research Foundation (DFG, Nr.: UT 158/1-1). Data were obtained from the Berlin hat Talent Study. The Berlin hat Talent Study is funded by the Senate of Berlin and is carried out by the DSHS Berlin. The funders had no role in study design, data collection, analysis, and interpretation. We acknowledge support from the Open Access Publication Fund of the University of Münster."