Research by members of the International Society

for the Study of Human Growth and Clinical Auxology

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The LMSz method - an automatable scalable approach TO CONSTRUCTING GENE-SPECIFIC growth charts in rare disorders

Karen J. Low. ABSTRACT (partial): Health professionals measure and plot children’s growth at intervals on appropriate charts to track the trajectory against reference centiles. Many children with genetic disorders plot on an extreme centile—in itself a clue to a possible underlying genetic diagnosis. Once a genetic diagnosis is made, plotting on a standard chart may be misleading. It may, for example, suggest a child is of short stature and underweight when they are growing normally for their genetic disorder, leading to clinical/parental anxiety resulting in unnecessary investigation and unwarranted/ineffective intervention.

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Testicular Ultrasound to Stratify Hormone REFERENCES IN a Cross-Sectional Norwegian Study of Male Puberty

André Madsen. ABSTRACT (partial): 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 stages. Determination of testicular volume (TV) by ultrasound provides a novel approach to assess puberty progression and stratify hormone reference intervals. Objective: The objective of this article is to establish references for serum testosterone and key hormones of the male pituitary-gonadal signaling pathway in relation to TV determined by ultrasound.

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References for Ultrasound Staging of Breast Maturation, Tanner Breast Staging, Pubic Hair, and Menarche in Norwegian Girls

Ingvild Særvold Bruserud. ABSTRACT (partial): 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 to Tanner breast (Tanner B) staging, and no normative data have been reported. Objective: To present normative references for US B along with references for Tanner B, pubic hair (PH), and menarche.

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Intrauterine metformin exposure and OFFSPRING CARDIOMETABOLIC risk factors (PedMet study): a 5–10 YEAR FOLLOW-UP of the PregMet randomised controlled trial

Liv Guro Engen Hanem. ABSTRACT (partial): Background: Metformin is increasingly used to treat gestational diabetes and type 2 diabetes in pregnancy, and in attempts to improve pregnancy outcomes in polycystic ovary syndrome and obesity. It passes across the placenta with possible long-term consequences for the offspring. We previously explored the effect of metformin, given to women with polycystic ovary syndrome during pregnancy, on children’s growth up to 4 years of age. In this 5–10 year follow-up, we examined the cardiometabolic risk factors in these children.

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Genome-wide association study reveals dynamicrole of genetic variation in infant and earlychildhood growth

Øyvind Helgeland. ABSTRACT (partial): Infant and childhood growth are dynamic processes with large changes in BMI during development. By performing genome-wide association studies of BMI at 12 time points from birth to eight years (9286 children, 74,105 measurements) in the Norwegian Mother, Father, and Child Cohort Study, replicated in 5235 children, we identify a transient effect in the leptin receptor (LEPR) locus: no effect at birth, increasing effect in infancy, peaking at 6–12 months (rs2767486, P6m = 2.0 × 10−21, β6m = 0.16 sd-BMI), and little effect after age five.

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Age at menarche and chemical exposure

Lawrence M. Schell. ABSTRACT (partial): Context: Humans are now exposed to a multitude of chemicals throughout the life course, some of which may affect growth and development owing to their endocrine-like activity.

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From growth charts to growth status: How concepts of optimal growth and tempo influence the interpretation of growth measurements

Babette S. Zemel. ABSTRACT (partial): Growth measurements are largely uninterpretable without comparison to a growth chart. Consequently, the characteristics of a growth chart become an integral component of the interpretation of growth measurements. The concepts of optimal growth and tempo are well recognised by auxologists, yet their implications for interpretation of growth measurements remain problematic.

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Smoothing reference centile curves: The LMS method and penalized likelihood

TJ Cole. ABSTRACT (partial): Reference centile curves show the distribution of a measurement as it changes according to some covariate, often age. The LMS method summarizes the changing distribution by three curves representing the median, coefficient of variation and skewness, the latter expressed as a Box-Cox power.

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SITAR—a useful instrument for growth curve analysis

TJ Cole. ABSTRACT (partial): Background: Growth curve analysis is a statistical issue in life course epidemi- ology. Height in puberty involves a growth spurt, the timing and intensity of which varies between individuals. Such data can be summarized with individual Preece–Baines (PB) curves, and their five parameters then related to earlier exposures or later outcomes. But it involves fitting many curves

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Sample size and sample composition for constructing growth reference centiles

TJ Cole. ABSTRACT (partial): Growth reference centile charts are widely used in child health to assess weight, height and other age-varying measure- ments. The centiles are easy to construct from reference data, using the LMS method or GAMLSS (Generalised Additive Models for Location Scale and Shape). However, there is as yet no clear guidance on how to design such studies, and in particular how many reference data to collect, and this has led to study sizes varying widely.

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