Methodological analysis demonstrates extended LMS-based body mass index cut-offs across pediatric age groups, suggesting simplified tracking of extreme weight categories.
Defining the international cut-offs in terms of the underlying LMS curves has several benefits. New cut-offs are easy to derive (e.g. BMI 35 for morbid obesity), and they can be expressed as BMI centiles (e.g. boys obesity = 98.9th centile), allowing them to be compared with other BMI references. For WHO, median BMI is relatively low in early life and high at older ages, probably due to its method of construction.
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Cole et al. (2012) studied this question.
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