Predictors and tracking of body mass index from adolescence into adulthood: follow-up of 18 to 20 years in the Oslo youth study. Search all BMC articles Search. As the mean age of menarche in Norway has been stable at No such change was seen for boys. Finally, the percentage of Norwegian adolescents meeting recommendations for daily physical activity corresponds to results from other European studies on adolescents [ 24 ] [ 25 ]. PBJ revised the manuscript.
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