Publication date: Feb 09, 2025

This study aims to describe and compare adherence to the 24-Hour Movement Guidelines (recommendations for physical activity, screen time, and sleep duration) among children before and during COVID-19 pandemic . The literature search was conducted on Web of Science, PubMed, MEDLINE, and SPORTDiscus for quantitative studies on 24-hour movement behaviors, published in English. The studies were categorized by collection date into before the pandemic (June 16th, 2016 – March 10, 2020) and during the pandemic (March 11th, 2020 – May 5, 2023), with all studies included. A random-effects model was employed to synthesize the adherence rates, and subgroup analyses were conducted based on age, sex, region, and Human development index (HDI) groups. Before the pandemic, 12. 1% (95% CI:10. 3%-13. 9%) of overall children met the three recommendations. During the pandemic, 8. 6% (95% CI: 6. 4%-11. 4%) of overall children met the three recommendations. The adherence to the three recommendations during the pandemic was 3. 5% lower (p

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