The recent paper investigating the use of adult and child-specific air displacement plethysmography (ADP) corrections by Bosy-Westphal et al. (1) is an important contribution to the field of pediatric body composition analysis. ADP is particularly suited and, as noted by the authors, increasingly being used for analysis in children and adolescents. The authors clearly demonstrated the substantial error associated with the use of adult prediction equations for the conversion of body density to percentage body fat and thoracic gas volume. A number of studies have supported the authors' findings demonstrating an over-estimation of the percentage of fat in children and adolescents using the Siri (1961) (2) 2-compartment density conversion equation compared with criterion 3- and 4-compartment models (3-5). Therefore, we commend the authors on their timely and important addition to the ADP literature as it specifically pertains to pediatric populations#
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