![]() ![]() Central questions including health, nutrition, activity, and perceived familial socioeconomic status from 2002, were repeated in 2017. The survey was a paper-questionnaire in 2002 and a web-based questionnaire in 2017. We conducted the second in 2017 in collaboration with the County Governor of Oppland, the supreme authority of all high schools in the county. The Norwegian Institute of Public Health conducted the first survey in 2002. Our aim was to explore whether an increasing mean BMI and prevalence of OWOB was due to increasing BMI within a subgroup of adolescents. In this study, we compared BMI distributions and the prevalence of OWOB in Norwegian adolescents in 10th grade (15–16 years of age) at 15-year intervals stratified by sex. As both the biology of OWOB and comorbidities due to central fat distribution differ by sex, sex-related trends in adolescent OWOB are important to elucidate for public health reasons. Īdolescents with obesity have a high risk of becoming adults with obesity. However, relatively few European studies have addressed this issue in adolescents, and even fewer are based on data from the last decade when the obesity epidemic is said to have stabilized in some countries. Population changes in BMI distributions over time have been studied in many countries, including the US. The prevalence of adolescent overweight and obesity (OWOB) has increased over the last decades, and studies have found that this change is primarily due to increasing BMI in subgroups in the upper percentiles of the BMI distribution. The relationship between body mass index (BMI) in adolescence and subsequent health in adulthood is well established, and both overly low and overly high BMI values are of concern. ConclusionĬontrary to previous knowledge, we found that the increase in OWOB presented a uniform shift in the entire BMI distribution for 15–16-year-old Norwegian girls and was not due to a larger shift in a specific subpopulation in the upper percentiles. The BMI density plots revealed similar shapes at both time points for both sexes, but the distribution for girls shifted to the right from 2002 to 2017. ![]() The prevalence of OWOB increased from 9 to 14% among girls (difference 5, 95% CI: 2, 8) and from 17 to 20% among boys (difference 3, 95% CI: − 1, 6%). The mean BMI increased from 20.7 to 21.4 ( p < 0.001) for girls but remained unchanged at 21.5 vs 21.4 ( p = 0.80) for boys. We calculated their BMI, BMI z-scores (BMIz), and the prevalence of OWOB. MethodsĪ cross-sectional study involving 15- to 16-year-old adolescents in Oppland, Norway, was undertaken in 20. This study aimed to describe the distributions of BMI and the point prevalence of OWOB in Norwegian adolescents in 20. The prevalence of overweight and obesity (OWOB) has stabilized in some countries, but a portion of children with high body mass index (BMI) may have become heavier. ![]()
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