Can Basic Characteristics Estimate Body Composition in Early Infancy?.

Objectives: Increasing evidence demonstrates that body composition in early life contributes to the programming of health later in life in both full-term and preterm infants. Given the important role of body composition, the increased availability of easy, non-invasive and accurate techniques for its assessment has been recommended. The aim of the present study was to identify basic characteristics and anthropometric measurements that best correlate with body composition in infants. Methods: Anthropometric measurements and body composition assessed by air-displacement plethysmography were assessed either at birth or at term-corrected age in 1239 infants (654 full-term, 585 preterm). The associations of gender, GA (gestational age) and weight with FFM (fat-free mass) and FM (fat mass) adjusted by length (g/cm) were investigated by multiple linear regression models. Bland-Altman tests were performed, and an equation for calculating FFM was determined. Results: Preterm infants exhibited increased FM and reduced FFM compared with full-term infants (477.6 +/- 204 g vs. 259.7 +/- 147 g and 2583 +/- 494 g vs. 2770 +/- 364 g, respectively). GA, male gender and weight were positively associated with FFM (R2 = 0.806, p

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