Scaling children's waist circumference for differences in body size
Authors
Nevill, Alan MDuncan, Michael J.
Lahart, Ian
Davies, Paul
Ramirez-Velez, Robinson
Sandercock, Gavin
Issue Date
2017-07-12
Metadata
Show full item recordAbstract
Objectives Both waist circumference (WC) and body size (height) increase with age throughout childhood. Hence, there is a need to scale WC in children to detect differences in adiposity status (eg, between populations and different age groups), independent of body size/height. Methods Using two culturally different samples, 1 English (10–15.9 years n = 9471) and 2 Colombian (14–15 years, n = 37,948), for WC to be independent of height (HT), a body shape index was obtained using the allometric power law WC = a.HTb. The model was linearized using log-transformation, and multiple regression/ANCOVA to estimate the height exponents for WC controlling for age, sex, and any other categorical/population differences. Results In both samples, the power-law height exponent varied systematically with age. In younger children (age 10–11 years), the exponent was approximately unity, suggesting that pre-pubertal children might be geometrically similar. In older children, the height exponent declined monotonically to 0.5 (ie, HT0.5) in 15+ year-olds, similar to the exponent observed in adults. UK children's height-adjusted WC revealed a “u” shaped curve with age that appeared to reach a minimum at peak-height velocity, different for boys and girls. Comparing the WC of two populations (UK versus Colombian 14–15-year-old children) identified that the gap in WC between the countries narrowed considerably after scaling for height. Conclusions Scaling children's WC for differences in height using allometric modeling reveals new insights into the growth and development of children's WC, findings that might well have been be overlooked if body size/height had been ignored.Citation
Nevill AM., Duncan MJ., Lahart IM., Davies P., Ramirez-Velez R., Sandercock G. (2017) 'Scaling children's waist circumference for differences in body size', American Journal of Human Biology, 29 (6) doi: 10.1002/ajhb.23037Publisher
WileyJournal
American Journal of Human BiologyAdditional Links
http://doi.wiley.com/10.1002/ajhb.23037Type
Journal articleLanguage
enISSN
1042-0533ae974a485f413a2113503eed53cd6c53
10.1002/ajhb.23037
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