Contents lists available at ScienceDirect Child Abuse & Neglect journal homepage: www.elsevier.com/locate/chiabuneg Associations between the Canadian 24 h movement guidelines and different types of bullying involvement among adolescents Hugues Sampasa-Kanyinga a,b, *, Ian Colman a,c , Gary S. Goldfield a,b , Ian Janssen d , JianLi Wang a,e , Hayley A. Hamilton f,g , Jean-Philippe Chaput a,b a School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada b Healthy Active Living and Obesity Research Group, Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada c Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway d School of Kinesiology and Health Studies, Queen’s University, Kingston, Ontario, Canada e University of Ottawa Institute of Mental Health Research, Ottawa, Ontario, Canada f Institute for Mental Health Policy Research, Centre for Addiction and Mental Health, Toronto, Ontario, Canada g Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada ARTICLE INFO Keywords: Physical activity Screen time Sleep School bullying Cyber bullying Canadian 24-hour movement guidelines ABSTRACT Background: The Canadian 24-Hour Movement Guidelines for Children and Youth recommend ≥60 min of physical activity per day, ≤2 h of recreational screen time per day, and 9−11 hours of sleep per night for 11–13 years old and 8−10 hours per night for 14–17 years old. Objective: This study examined the association between combinations of these recommendations and school bullying and cyberbullying victimization and perpetration among adolescents. Participants and Setting: A total of 5615 Canadian students (mean age = 15.2 years) who par- ticipated in the 2017 Ontario Student Drug Use and Health Survey (OSDUHS) self-reported their physical activity, screen time, sleep duration, and their involvement in bullying. Methods: Logistic regression analyses were adjusted for important covariates. Results: Meeting the screen time recommendation alone was associated with lower odds of being a victim (OR: 0.64; 95 % CI: 0.46−0.88) or a bully (OR: 0.64; 95 % CI: 0.43−0.96) at school and a victim of cyberbullying (OR: 0.67; 95 % CI: 0.49−0.91). Meeting both the screen time and sleep duration recommendations was associated with lower odds of being a bully (OR: 0.51; 95 % CI: 0.30−0.88). Meeting all 3 recommendations showed stronger associations (i.e. lowest risk) with being a victim of school bullying (OR: 0.32; 95 % CI: 0.19−0.54), a bully-victim (OR: 0.25; 95 % CI: 0.08−0.78) or a victim of cyberbullying (OR: 0.37; 95 % CI: 0.17−0.84). Conclusions: Our findings provide evidence that meeting the 24 -h movement guidelines is as- sociated with lower odds of bullying involvement. Encouraging adherence to the 24 -h movement guidelines could be a good behavioural target to prevent involvement in both school bullying and cyberbullying. 1. Introduction Bullying is often defined as an aggression that is intentionally carried out by one or more individuals and repeatedly targeted https://doi.org/10.1016/j.chiabu.2020.104638 Received 4 April 2020; Received in revised form 3 July 2020; Accepted 17 July 2020 ⁎ Corresponding author at: School of Epidemiology and Public Health, University of Ottawa, 600 Peter Morand Crescent, Ottawa, Ontario, K1G 5Z3 Canada. E-mail address: hsampasa@uottawa.ca (H. Sampasa-Kanyinga). Child Abuse & Neglect 108 (2020) 104638 0145-2134/ © 2020 Elsevier Ltd. All rights reserved. T