Summary: | Flavie Perrier,1 Reza Ghiasvand,2,3 Simon Lergenmuller,1 Trude E Robsahm,3 Adele C Green,4,5 Kristin B Borch,6 Torkjel M Sandanger,6 Elisabete Weiderpass,7 Corina S Rueegg,2 Marit B Veierød1 1Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway; 2Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway; 3Cancer Registry of Norway, Institute of Population-Based Cancer Research, Oslo, Norway; 4QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia; 5Cancer Research UK Manchester and Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK; 6Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway; 7International Agency for Research on Cancer, Lyon, FranceCorrespondence: Flavie Perrier, Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, PO Box 1122, Blindern, Oslo, N-0317, Norway, Email flavie.perrier@medisin.uio.noPurpose: Physical activity (PA) is a cornerstone in disease prevention and varies throughout life. A pooled analysis of cohort studies and a meta-analysis of cohort studies found positive associations between PA and melanoma risk. However, previous studies focused on PA at specific ages and often lacked information on ultraviolet radiation (UVR) exposure. Using the population-based Norwegian Women and Cancer (NOWAC) cohort, including information on PA and UVR exposure, we estimated life-course PA trajectories from adolescence to adulthood and their associations with melanoma.Methods: Total PA across different domains (recreation, occupation, transport, household) was reported for ages 14 and 30 years, and when responding to the questionnaire (31– 76 years) using a 10-point scale, validated to rank PA levels in Norwegian females. We estimated life-course PA trajectories using a latent class mixed model in ...
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