Blar i Bergen Open Research Archive på forfatter "Bjerknes, Robert"
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BMI and BMI SDS in childhood: annual increments and conditional change
Brannsether-Ellingsen, Bente; Eide, Geir Egil; Roelants, Mathieu; Bjerknes, Robert; Juliusson, Petur Benedikt (Peer reviewed; Journal article, 2016)Background: Early detection of abnormal weight gain in childhood may be important for preventive purposes. It is still debated which annual changes in BMI should warrant attention. Aim: To analyse 1-year increments of Body ... -
Deep phenotyping of pubertal development in Norwegian children: the Bergen Growth Study 2
Juliusson, Petur B.; Bruserud, Ingvild S.; Oehme, Ninnie Helen Bakken; Madsen, Andre; Forthun, Ingvild Halsør; Balthasar, Melissa Rajini; Viste, kristin; Jugessur, Astanand; Schell, Lawrence M.; Bjerknes, Robert; Roelants, Mathieu; Karen, Rosendahl (Journal article; Peer reviewed, 2023)Background The Bergen Growth Study 2 (BGS2) aims to characterise somatic and endocrine changes in healthy Norwegian children using a novel methodology. Subjects and methods A cross-sectional sample of 1285 children ... -
Exposure to Per- and Polyfluoroalkyl Substances and Timing of Puberty in Norwegian Boys: Data from the Bergen Growth Study 2
Forthun, Ingvild Halsør; Roelants, Mathieu; Knutsen, Helle Katrine; Haug, Line Småstuen; Iszatt, Nina; Schell, Lawrence M.; Jugessur, Astanand; Bjerknes, Robert; Oehme, Ninnie Helen Bakken; Madsen, Andre Greger; Bruserud, Ingvild S.; Juliusson, Pétur Benedikt (Journal article; Peer reviewed, 2024)Per- and polyfluoroalkyl substances (PFAS) are widespread environmental contaminants with endocrine-disruptive properties. Their impact on puberty in boys is unclear. In this cross-sectional study, we investigated the ... -
A Family-Oriented Intervention Programme to Curtail Obesity From Five Years of Age Had No Effect Over No Intervention
Donkor, Hilde Mjell; Grundt, Jacob Holter; Juliusson, Petur Benedikt; Eide, Geir Egil; Hurum, Jørgen; Bjerknes, Robert; Markestad, Trond Jacob (Peer reviewed; Journal article, 2020)Aim: To examine the effect of a family‐oriented multidisciplinary intervention programme to curtail weight increase in young children with obesity. Methods: Children who weighed more than one kilogram above the 97th ... -
Hereditary hypophosphatemia in Norway: A retrospective population-based study of genotypes, phenotypes, and treatment complications
Rafaelsen, Silje Hjorth; Johansson, Stefan; Ræder, Helge; Bjerknes, Robert (Peer reviewed; Journal article, 2016-02)Objective: Hereditary hypophosphatemias (HH) are rare monogenic conditions characterized by decreased renal tubular phosphate reabsorption. The aim of this study was to explore the prevalence, genotypes, phenotypic spectrum, ... -
Hormone references for ultrasound breast staging and endocrine profiling to detect female onset of puberty
Madsen, Andre; Bruserud, Ingvild Særvold; Bertelsen, Bjørn-Erik; Roelants, Mathieu; Oehme, Ninnie; Viste, Kristin; Bjerknes, Robert; Almås, Bjørg; Rosendahl, Karen; Mellgren, Gunnar; Sagen, Jørn V.; Juliusson, Petur Benedikt (Journal article; Peer reviewed, 2020)Context Application of ultrasound (US) to evaluate attainment and morphology of glandular tissue provides a new rationale for evaluating onset and progression of female puberty, but currently no hormone references complement ... -
Interrelationships between anthropometric variables and overweight in childhood and adolescence
Brannsether-Ellingsen, Bente; Eide, Geir Egil; Roelants, Mathieu; Bjerknes, Robert; Júlíusson, Pétur Benedikt (Peer reviewed; Journal article, 2014-04-30)Objectives To answer the questions: how does body mass index (BMI) correlate to five overweight related anthropometric variables during different ages in childhood, and which anthropometric variables contribute most to ... -
Levels of per- and polyfluoroalkyl substances (PFAS) in Norwegian children stratified by age and sex - Data from the Bergen Growth Study 2
Forthun, Ingvild Halsør; Roelants, Mathieu; Haug, Line Småstuen; Knutsen, Helle Katrine; Schell, Lawrence M.; Jugessur, Astanand; Bjerknes, Robert; Sabaredzovic, Azemira; Bruserud, Ingvild S.; Juliusson, Petur Benedikt (Journal article; Peer reviewed, 2023)Background and aim Due to the persistence, bioaccumulation and potential adverse health effects, there have been restrictions and phase out in the production of certain per- and polyfluoroalkyl substances (PFAS) since the ... -
Long-term clinical outcome and phenotypic variability in hyperphosphatemic familial tumoral calcinosis and hyperphosphatemic hyperostosis syndrome caused by a novel GALNT3 mutation; case report and review of the literature
Rafaelsen, Silje Hjorth; Johansson, Stefan; Ræder, Helge; Bjerknes, Robert (Peer reviewed; Journal article, 2014-09-24)Background: Hyperphosphatemic Familial Tumoral Calcinosis (HFTC) and Hyperphosphatemic Hyperostosis Syndrome (HHS) are associated with autosomal recessive mutations in three different genes, FGF23, GALNT3 and KL, leading ... -
Low BMI, but not high BMI, influences the timing of puberty in boys
Oehme, Ninnie Helen Bakken; Roelants, Mathieu; Bruserud, Ingvild Særvold; Madsen, Andre; Bjerknes, Robert; Rosendahl, Karen; Juliusson, Pétur Benedikt (Journal article; Peer reviewed, 2021)Background Previous studies investigating the association between weight status and onset of puberty in boys have been equivocal. It is currently unclear to what extent weight class influences puberty onset and ... -
Norwegian children and adolescents in blended families are at risk of larger one-year BMI increments
Kristiansen, Hege; Roelants, Mathieu; Bjerknes, Robert; Juliusson, Petur Benedikt (Peer reviewed; Journal article, 2020)Aim: To study how sociodemographic factors and family structure associate with baseline BMI z‐scores (BMIz) and BMIz change in 767 Norwegian children aged 6‐15 years. Methods: Baseline BMIz and 1‐year BMIz increments in ... -
Psychological health in preschool children with underweight, overweight or obesity: a regional cohort study
Donkor, Hilde Mjell; Toxe, Helene; Hurum, Jørgen; Bjerknes, Robert; Eide, Geir Egil; Juliusson, Pétur Benedikt; Markestad, Trond Jacob (Journal article; Peer reviewed, 2021)Objective To examine if underweight (UW), overweight (OW) or obesity (OB), or body mass index (BMI) expressed as its SD score (BMI SDS), were associated with psychological difficulties in preschool children. Design ... -
Reference curves for pediatric endocrinology: leveraging biomarker z-scores for clinical classifications
Madsen, Andre; Almås, Bjørg; Bruserud, Ingvild Særvold; Oehme, Ninnie Helen Bakken; Nielsen, Christopher Sivert; Roelants, Mathieu; Hundhausen, Thomas Eckhard; Ljubicic, Marie Lindhardt; Bjerknes, Robert; Mellgren, Gunnar; Sagen, Jørn V.; Juliusson, Pétur Benedikt; Viste, Kristin (Journal article; Peer reviewed, 2022)Context Hormone reference intervals in pediatric endocrinology are traditionally partitioned by age and lack the framework for benchmarking individual blood test results as normalized z-scores and plotting sequential ... -
Reference data for testicular volume measured with ultrasound and pubic hair in Norwegian boys are comparable with Northern European populations
Oehme, Ninnie; Roelants, Mathieu; Bruserud, Ingvild Særvold; Madsen, Andre; Eide, Geir Egil; Bjerknes, Robert; Rosendahl, Karen; Juliusson, Petur Benedikt (Peer reviewed; Journal article, 2020)Aim: To estimate references for testicular volume measured with ultrasound and Tanner stages of pubic hair in Norwegian boys, and to compare the timing of puberty with data from similar populations. Methods: Testicular ... -
References for ultrasound staging of breast maturation, tanner breast staging, pubic hair, and menarche in Norwegian girls
Bruserud, Ingvild Særvold; Roelants, Mathieu; Oehme, Ninnie; Madsen, Andre; Eide, Geir Egil; Bjerknes, Robert; Rosendahl, Karen; Juliusson, Petur Benedikt (Journal article; Peer reviewed, 2020)Context: Discriminating adipose and glandular tissue is challenging when clinically assessing breast development. Ultrasound facilitates staging of pubertal breast maturation (US B), but has not been systematically compared ... -
Testicular ultrasound to stratify hormone references in a cross-sectional Norwegian study of male puberty
Madsen, Andre; Oehme, Ninnie; Roelants, Mathieu; Bruserud, Ingvild Særvold; Eide, Geir Egil; Viste, Kristin; Bjerknes, Robert; Almås, Bjørg; Rosendahl, Karen; Sagen, Jørn V.; Mellgren, Gunnar; Juliusson, Petur Benedikt (Peer reviewed; Journal article, 2020)Context: Testicular growth represents the best clinical variable to evaluate male puberty, but current pediatric hormone references are based on chronological age and subjective assessments of discrete puberty development ... -
Timing of menarche in Norwegian girls: Associations with body mass index, waist circumference and skinfold thickness
Bratke, Heiko; Bruserud, Ingvild Særvold; Brannsether-Ellingsen, Bente; Assmus, Jörg; Bjerknes, Robert; Roelants, Mathieu; Juliusson, Petur Benedikt (Peer reviewed; Journal article, 2017-06-06)Background: Research studies show conflicting results regarding the association between menarche and body weight. The purpose of the present study was to investigate if anthropometric indicators of body composition, body ...