• Beyond sleep duration: Sleep timing as a risk factor for childhood obesity 

      Skjåkødegård, Hanna Flækøy; Danielsen, Yngvild Sørebø; Frisk, Bente; Hystad, Sigurd William; Roelants, Mathieu; Pallesen, Ståle; Conlon, Rachel; Wilfley, Denise E.; Juliusson, Petur Benedikt (Journal article; Peer reviewed, 2021)
      Background: Ample evidence attests to the relationship between short sleep duration, sleep problems and childhood obesity. However, few studies have examined the association between sleep timing and obesity in ...
    • 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 ...
    • 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 ...
    • Important periods of weight development in childhood: a population-based longitudinal study 

      Glavin, Kari; Roelants, Mathieu; Strand, Bjørn Heine; Júlíusson, Pétur Benedikt; Lie, Kari Kveim; Helseth, Sølvi; Hovengen, Ragnhild (Peer reviewed; Journal article, 2014-02-13)
      Background: Identifying important ages for the development of overweight is essential for optimizing preventive efforts. The purpose of the study was to explore early growth characteristics in children who become overweight ...
    • 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 ...
    • 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 ...
    • Monitoring children and adolescents with severe obesity: body mass index (BMI), BMI z‐score or percentage above the International Obesity Task Force overweight cut‐off? 

      Løkling, Hanne L; Roelants, Mathieu; Kommedal, Kristin; Skjåkødegård, Hanna Flækøy; Apalset, Ellen M; Benestad, Beate; Morken, Mette Helvik; Hjelmesæth, Jøran; Juliusson, Petur Benedikt (Peer reviewed; Journal article, 2019)
      Aim: Body mass index (BMI) metrics are widely used as a proxy for adiposity in children with severe obesity. The BMI expressed as the percentage of a cut‐off percentile for overweight or obesity has been proposed as a ...
    • 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 ...
    • 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 ...
    • Reference ranges for head circumference in ethiopian children 0-2 years of age 

      Amare, Ephrem Bililigne; Idsøe, Mari; Wiksnes, Miriam; Moss, Thomas; Roelants, Mathieu; Shimelis, Damte; Juliusson, Petur Benedikt; Kiserud, Torvid; Wester, Knut (Peer reviewed; Journal article, 2015-12)
      BACKGROUND: Head circumference (HC) charts are important for early detection of hydrocephalus during childhood. In low-income countries where populationbased HC charts are rarely available, hydrocephalus occurs more commonly ...
    • 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 ...