title: Inverted BMI rather than BMI is a better predictor of DEXA determined body fatness in children.
abstract: This study compared body mass index (BMI) and inverted BMI (iBMI) as predictors of body fatness in 177 Portuguese children (149 girls and 96 boys) aged 7-16 years. Participants undertook measures of height and body mass from which BMI (kg/m(2)) and iBMI (cm(2)/kg) were determined. Maturation was determined via self-report and fat mass index (FMI, kg/m(2)) via dual-energy X-ray absorptiometry. Significant relationships were evident between BMI and iBMI and FMI (both P=0.0001). BMI was not normally distributed (P=0.0001) but iBMI was (P>0.05). Analysis of covariance identified that BMI and iBMI, controlling for maturation, were both significant predictors of FMI (both P=0.0001) but that iBMI predicted a slightly greater amount of the variance (adjusted R(2)=0.970) compared with BMI (adjusted R(2)=0.968). This study suggests that iBMI is a similar proxy for body fatness compared with BMI in children.
authors.affiliation: Department of Biomolecular and Sports Science, Coventry University, Coventry, UK.
authors.forename: M J
authors.initials: MJ
authors.lastname: Duncan
authors.affiliation: 1] Faculty of Sports/Research Centre in Physical Activity, Health and Leisure-CIAFEL, University of Porto, Porto, Portugal [2] High Education Institute from Maia/Research Centre in Physical Activity, Health and Leisure-CIAFEL, Porto, Portugal.
authors.forename: C
authors.initials: C
authors.lastname: Martins
authors.affiliation: Faculty of Sports/Research Centre in Physical Activity, Health and Leisure-CIAFEL, University of Porto, Porto, Portugal.
authors.forename: G
authors.initials: G
authors.lastname: Silva
authors.affiliation: 1] Faculty of Sports/Research Centre in Physical Activity, Health and Leisure-CIAFEL, University of Porto, Porto, Portugal [2] High Education Institute from Maia/Research Centre in Physical Activity, Health and Leisure-CIAFEL, Porto, Portugal.
authors.forename: E
authors.initials: E
authors.lastname: Marques
authors.affiliation: Faculty of Sports/Research Centre in Physical Activity, Health and Leisure-CIAFEL, University of Porto, Porto, Portugal.
authors.forename: J
authors.initials: J
authors.lastname: Mota
authors.affiliation: 1] Faculty of Sports/Research Centre in Physical Activity, Health and Leisure-CIAFEL, University of Porto, Porto, Portugal [2] High Education Institute from Maia/Research Centre in Physical Activity, Health and Leisure-CIAFEL, Porto, Portugal.
authors.forename: L
authors.initials: L
authors.lastname: Aires
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D000293:Adolescent; D001823:Body Composition; D015992:Body Mass Index; D001835:Body Weight; D002648:Child; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009043:Motor Activity; D011174:Portugal; D057566:Self Report; D044465:White People