Birth weight categorization according to gestational age does not reflect percentage body fat in term and preterm newborns
Birth weight categorization according to gestational age does not reflect percentage body fat in term and preterm newborns
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DOI：
10.1007/s00431-006-0209-x
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发表时间：
2007-02-01
影响因子：
3.6
通讯作者：
Fusch, Christoph
中科院分区：
文献类型：
--
作者：
Schmelzle, Hansjoerg Rudolf;Quang, Dung Nguyen;Fusch, Christoph
本研究旨在证明根据出生体重的小于胎龄（SGA）、适合胎龄（AGA）和大于胎龄（LGA）分类可预测足月儿和早产儿通过双能 X 射线吸收测定法（DXA）测量的体脂百分比（%BF）。对两项纵向研究中分娩胎龄为 38.4 周的 159 名健康足月和早产新生儿（87 名男孩和 72 名女孩）的数据进行了分析。出生后 10 天内评估人体测量和身体成分数据。计算人体测量参数与 DXA 测量的脂肪量之间的相关性。根据性别和胎龄，比较 SGA、AGA 和 LGA 组之间通过 DXA 测量的低、中和高 %BF 观察结果的发生率。足月儿中，体脂低于10%的新生儿中，42.9%属于AGA；所有 AGA 新生儿中 9.9% 的体脂低于 10%。对于整个组来说，在所研究的比率中，体重身长比（r=0.82）显示出与 DXA 测量的脂肪量的最佳相关性。研究时女孩的 %BF (14.75%) 高于男孩 (11.95%)。总之，基于出生体重百分位的传统分类不能反映足月和早产新生儿的 %BF。
This study was performed to prove the applicability of the small-for-gestational age (SGA), appropriate-for-gestational age (AGA), and large-for-gestational age (LGA) classification depending on birth weight to predict percentage body fat (%BF) measured by dual-energy X-ray absorptiometry (DXA) in term and preterm infants. The data of 159 healthy term and preterm neonates (87 boys and 72 girls) with a gestational age at delivery of 38.4 weeks from two longitudinal studies were analyzed. Anthropometry and body composition data were assessed within the first 10 days after birth. Correlations between anthropometric parameters and fat mass measured by DXA were calculated. Prevalences of observations with low, middle, and high %BF measured by DXA were compared between SGA, AGA, and LGA groups, according to sex and gestational age. In term infants, 42.9% of the newborns with less than 10% body fat were classified to be AGA; 9.9% of all AGA newborns had less than 10% body fat. For the whole group, among the ratios investigated, the weight-length ratio (r=0.82) showed the best correlation to fat mass measured by DXA. The %BF at the time of study was higher in girls (14.75%) than in boys (11.95%). In conclusion, traditional classification based on birth weight centiles does not reflect %BF in term and preterm newborns.