Anjana, Ranjit MohanRanjani, HarishCerin, EsterAkram, MuhammadSalmon, JoConway, Terry LCain, Kelli LPradeepa, RajendraBarnett, AnthonySit, Cindy HPVan Dyck, DelfienHino, Adriano AkiraPizarro, AndreiaOyeyemi, Adewale LMuda, Wan Abdul Manan WanMoran, Mika RTroelsen, JensMitáš, JosefIslam, M ZakiulQueralt, AnaMohan, ViswanathanHinckson, EricaSallis, James F2024-12-062024-12-062024-11-29International Journal of Behavioral Nutrition and Physical Activity, ISSN: 1479-5868 (Print); 1479-5868 (Online), BMC, 21(1), 136-. doi: 10.1186/s12966-024-01678-41479-58681479-5868http://hdl.handle.net/10292/18422BACKGROUND: Understanding environmental correlates of sedentary behaviour (SB) among young people is important as such data can identify approaches to limit sedentary time. This paper estimates associations of parent-reported neighbourhood and adolescent-reported home environments with SB among adolescents aged 11-19 years from 14 countries. METHODS: In the International Physical activity and the Environment Network (IPEN) Adolescent Study (an observational, cross-sectional multi-country study), adolescents wore a triaxial accelerometer for seven days that assessed sedentary time (ST). Adolescents completed survey measures of sedentary behaviour (SB) related to recreational screen time and sitting time in motor vehicles. Parents and adolescents completed surveys assessing neighbourhood and home environments. Accelerometer based ST was available in 3,982 adolescents while survey data were available for 6,302 dyads. We estimated the total and direct effects of each environmental attribute on ST and SB. Sex of the adolescent and city/country were examined as moderators. RESULTS: The average ST in adolescents from 14 countries ranged from 7.8 to 10.5 h/day. Personal social media was the only significant correlate of total ST across both sexes. With respect to self-reported SB, adolescents accumulated an average of 3.8 h of non-school screen time per day and nearly 40 min of transport-related sitting time. Screen time was associated with all home environment variables, including social media account, as well as land use mix-diversity, traffic safety, and crime safety. Transport-related sitting time was related to land use mix-diversity, recreation facilities, walking facilities, and pedestrian infrastructure, but no home environment variables. City/country and sex were significant moderators of several associations. CONCLUSIONS: Both home and neighbourhood environment features were related to ST and SB. Having social media accounts emerged as a major contributor towards sedentarism in adolescents.Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.http://creativecommons.org/licenses/by/4.0/AccelerometerBuilt environmentScreen timeSedentary timeSocial mediaYouthAccelerometerBuilt environmentScreen timeSedentary timeSocial mediaYouth3213 Paediatrics32 Biomedical and Clinical Sciences4206 Public Health42 Health SciencesWomen's HealthPhysical ActivityBehavioral and Social SciencePediatricCardiovascular15 Life on Land11 Medical and Health Sciences13 EducationPublic Health3210 Nutrition and dietetics4202 Epidemiology4207 Sports science and exerciseAccelerometryAdolescentAdolescent BehaviorChildCross-Sectional StudiesEnvironment DesignExerciseFemaleHumansMaleParentsResidence CharacteristicsScreen TimeSedentary BehaviorSocial MediaSurveys and QuestionnairesYoung AdultHumansAdolescentSedentary BehaviorCross-Sectional StudiesMaleFemaleResidence CharacteristicsChildYoung AdultAccelerometryAdolescent BehaviorExerciseScreen TimeEnvironment DesignSurveys and QuestionnairesSocial MediaParentsHumansAdolescentSedentary BehaviorCross-Sectional StudiesMaleFemaleResidence CharacteristicsChildYoung AdultAccelerometryAdolescent BehaviorExerciseScreen TimeEnvironment DesignSurveys and QuestionnairesSocial MediaParentsJournal ArticleOpenAccess10.1186/s12966-024-01678-4