The impact of screen time changes on anxiety during the COVID-19 pandemic: sleep and physical activity as mediators.

"Declarations Conflict of interestThe authors report no conflict of financial or academic interest. All authors have read and approved the manuscript. Ethical approvalThis study was conducted in accordance with the Declaration of Helsinki and approved by the Medical Ethical Committee of the South China Normal University (of the principal investigator N.M., Approval No. SCNU-PSY-2020-1-015). Informed consentEach participant signed informed consent before study commencement. Conflict of interest The authors report no conflict of financial or academic interest. All authors have read and approved the manuscript."

"This work was supported by The MOE (Ministry of Education in China) Project of Humanities and Social Sciences (No. 21YJC190011) and Guangdong Basic and Applied Basic Research Foundation, China (No. 2019A1515012182)."