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BACKGROUND: Somatic and bone development have each been studied in detail, but rarely in conjunction. AIM: The aim of this study was to determine what somatic and bone development have in common and how they differ. A second aim was to check for a pubertal spurt in bone age (BA) and to quantify it in a similar way as has been done for height. The Preece-Baines model is used to fit longitudinal data for BA. SUBJECTS AND METHODS: The data analysed are from the 1st Zurich Longitudinal Growth Study comprising 120 boys and 112 girls with almost complete data from birth to adulthood. RESULTS: Variability of somatic milestones was reduced in terms of BA and there was an aftergrowth after reaching adult RUS score 1000. A strong increase in the RUS score was seen at a late stage of the pubertal spurt (PS). Somatic milestones correlated with the RUS score attained at these ages and more so at an early stage of the PS. A PS for BA was clearly identified with a location at 14.2 years for boys and 12.2 years for girls. Age of peak bone development correlated highly with age of peak velocity of somatic variables. CONCLUSIONS: BA can be successfully modelled as a semi-quantitative entity. Bone development shows marked associations with somatic development, despite the fact that the latter reflects changes in size, while the former is essentially a maturity index and reflects changes in biochemical composition of tissues.
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