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The objective of the study was to assess the variations in objectively measured physical activity and sedentary time in children and adolescents across Europe.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>Six databases were systematically searched to identify pan-European and national data sets on physical activity and sedentary time assessed by the same accelerometer in children (2 to 9.9\u2009years) and adolescents (\u226510 to 18\u2009years). We harmonized individual-level data by reprocessing hip-worn raw accelerometer data files from 30 different studies conducted between 1997 and 2014, representing 47,497 individuals (2\u201318\u2009years) from 18 different European countries.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>Overall, a maximum of 29% (95% CI: 25, 33) of children and 29% (95% CI: 25, 32) of adolescents were categorized as sufficiently physically active. We observed substantial country- and region-specific differences in physical activity and sedentary time, with lower physical activity levels and prevalence estimates in Southern European countries. Boys were more active and less sedentary in all age-categories. The onset of age-related lowering or leveling-off of physical activity and increase in sedentary time seems to become apparent at around 6 to 7\u2009years of age.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusions<\/jats:title>\n<jats:p>Two third of European children and adolescents are not sufficiently active. Our findings suggest substantial gender-, country- and region-specific differences in physical activity. These results should encourage policymakers, governments, and local and national stakeholders to take action to facilitate an increase in the physical activity levels of young people across Europe.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s12966-020-00930-x","type":"journal-article","created":{"date-parts":[[2020,3,18]],"date-time":"2020-03-18T03:03:16Z","timestamp":1584500596000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":278,"title":["Variations in accelerometry measured physical activity and sedentary time across Europe \u2013 harmonized analyses of 47,497 children and adolescents"],"prefix":"10.1186","volume":"17","author":[{"name":"On behalf of the Determinants of Diet and Physical Activity knowledge hub (DEDIPAC); International Children\u2019s Accelerometry Database (ICAD) Collaborators, IDEFICS Consortium and HELENA Consortium","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3710-9021","authenticated-orcid":false,"given":"Jostein","family":"Steene-Johannessen","sequence":"first","affiliation":[]},{"given":"Bj\u00f8rge Herman","family":"Hansen","sequence":"additional","affiliation":[]},{"given":"Knut Eirik","family":"Dalene","sequence":"additional","affiliation":[]},{"given":"Elin","family":"Kolle","sequence":"additional","affiliation":[]},{"given":"Kate","family":"Northstone","sequence":"additional","affiliation":[]},{"given":"Niels Christian","family":"M\u00f8ller","sequence":"additional","affiliation":[]},{"given":"Anders","family":"Gr\u00f8ntved","sequence":"additional","affiliation":[]},{"given":"Niels","family":"Wedderkopp","sequence":"additional","affiliation":[]},{"given":"Susi","family":"Kriemler","sequence":"additional","affiliation":[]},{"given":"Angie S.","family":"Page","sequence":"additional","affiliation":[]},{"given":"Jardena J.","family":"Puder","sequence":"additional","affiliation":[]},{"given":"John J.","family":"Reilly","sequence":"additional","affiliation":[]},{"given":"Luis B.","family":"Sardinha","sequence":"additional","affiliation":[]},{"given":"Esther M. 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