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Multifaceted data relating to activity and sleep from child and parent questionnaires analysed with anthropometric data collected during routine clinical care. Associations between sleep duration and activity measures were examined via regression models with adjustment for potential confounders.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Higher BMI was associated with more hours spent watching television (<jats:italic>P<\/jats:italic> = 0.04), as well as less reported enjoyment of physical activity (<jats:italic>P<\/jats:italic> = 0.005) and less time spent in organised sport activity (<jats:italic>P<\/jats:italic> = 0.005). Higher BMI was also associated with higher levels of obstructive sleep apnoea (<jats:italic>P<\/jats:italic> = 0.002). Less time in bed was associated with higher levels of BMI (<jats:italic>P<\/jats:italic> = 0.03) but analysis by sex revealed this association to only hold for males. In the whole group, a significant television and sleep interaction was seen, such that increasing television watching was associated with higher BMI, but only in those with shortest sleep duration.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Both poor sleep and increasing screen time (including television viewing, smart\u2010phone use, internet use or video\u2010gaming) appear to impact BMI in children with obesity, with a particular detrimental effect of television viewing in those who sleep less. Efforts to improve sleep time and quality in children may minimise negative effects of screen time on increasing BMI and should be included in public health strategies to combat obesity in childhood.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jpc.14711","type":"journal-article","created":{"date-parts":[[2019,12,10]],"date-time":"2019-12-10T14:27:05Z","timestamp":1575988025000},"page":"721-726","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Time spent watching television impacts on body mass index in youth with obesity, but only in those with shortest sleep duration"],"prefix":"10.1111","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4797-8025","authenticated-orcid":false,"given":"Daniel M","family":"Golshevsky","sequence":"first","affiliation":[{"name":"Department of General Medicine Royal Children's Hospital  Melbourne Victoria Australia"},{"name":"Department of Paediatrics University of Melbourne  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Costan","family":"Magnussen","sequence":"additional","affiliation":[{"name":"Menzies Institute for Medical Research University of Tasmania  Hobart Tasmania Australia"},{"name":"Research Centre of Applied and Preventive Cardiovascular Medicine University of Turku  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Markus","family":"Juonala","sequence":"additional","affiliation":[{"name":"Centre for Hormone Research Murdoch Children's Research Institute  Melbourne Victoria Australia"},{"name":"Department of Medicine University of Turku  Turku Finland"},{"name":"Division of Medicine Turku University Central Hospital  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kung\u2010Ting","family":"Kao","sequence":"additional","affiliation":[{"name":"Department of General Medicine Royal Children's Hospital  Melbourne Victoria Australia"},{"name":"Department of Paediatrics University of Melbourne  Melbourne Victoria Australia"},{"name":"Centre for Hormone Research Murdoch Children's Research Institute  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brooke E","family":"Harcourt","sequence":"additional","affiliation":[{"name":"Department of General Medicine Royal Children's Hospital  Melbourne Victoria Australia"},{"name":"Department of Paediatrics University of Melbourne  Melbourne Victoria Australia"},{"name":"Centre for Hormone Research Murdoch Children's Research Institute  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew A","family":"Sabin","sequence":"additional","affiliation":[{"name":"Department of General Medicine Royal Children's Hospital  Melbourne Victoria Australia"},{"name":"Department of Paediatrics University of Melbourne  Melbourne Victoria Australia"},{"name":"Centre for Hormone Research Murdoch Children's Research Institute  Melbourne Victoria Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,12,10]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(14)60460-8"},{"key":"e_1_2_7_3_1","volume-title":"Impact of overweight and obesity as a risk factor for chronic conditions: Australian Burden of Disease Study","author":"Australian Institute of Health and Welfare","year":"2017"},{"key":"e_1_2_7_4_1","first-page":"S1","article-title":"Childhood predictors of adult obesity: A systematic review","volume":"23","author":"Parsons TJ","year":"1999","journal-title":"Int. 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