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During follow-up, TV viewing time increased both on school days and on weekends, but to a greater extent during weekends.17 As adolescence is a time of increasing independence and adoption of new behaviours, we regarded screen time spent during weekends (ScTWends) as the best expression of the participants preferred pastime with a plausible effect on health. In this study, we explored the associations between hours of ScTWends and BMD levels among adolescents participating in Fit Futures 1 (FF1), as well as the persisting association with repeated bone measurements 2?years later, in Fit Futures 2 (FF2). Methods Study population and design: Fit Futures The Troms? Study18 is a population-based study with repeated health surveys in the municipality of Troms? inviting all residents in specific age groups. Fit Futures is an expansion of the Troms? Study, in collaboration between the University Hospital of North Norway (UNN HF), UiT The Arctic University of Norway and the National Public Health Institute. In 2010/2011, all first-year upper-secondary school students in the two neighbouring municipalities Troms? and Balsfjord were invited to participate in the cross-sectional study FF1.19 The invited cohort included 1117 participants aged 15�C19?years, of which 1038 adolescents (530 boys) attended the find more survey, providing an attendance rate of 92.9%. This paper includes participants younger than 18?years in FF1 (469 girls and 492 boys). A second wave of the survey, FF2, carried out in 2012/2013, invited all the third-year students to a follow-up. In total, 820 students attended, providing repeated BMD measurements in 372 girls and 316 boys, that is, 66% of the original cohort. Information of the study was given in classrooms; written information was handed out and also distributed through the schools�� websites. Participants 16?years and older signed a declaration when arriving at the study site, and younger participants had to bring written permission from their guardians. Dedicated research technicians performed the examinations in a well-established research unit at UNN HF. Measurements The main outcomes in the present study were BMD at the total hip, femoral neck and total body measured as g/cm?, by dual X-ray absorptiometry (DXA; GE Lunar prodigy, Lunar Corporation, Madison, Wisconsin, USA), with enCORE paediatric software.20 At arrival, information on pregnancy was obtained through a clinical interview. In cases of possible pregnancy, those participants were excluded from DXA scanning. Height and weight were measured in all participants to the nearest 0.1?cm and 0.1?kg on an automatic electronic scale, the Jenix DS 102 stadiometer. Measurements were performed according to standardised procedures in the Troms? Study, wearing light clothing without shoes. Body mass index (BMI) was calculated as weight (kg) divided by height squared (m2).