title: Predictive Validity of the Body Adiposity Index in Overweight and Obese Adults Using Dual-Energy X-ray Absorptiometry.
abstract: The body adiposity index (BAI) is a recent anthropometric measure proven to be valid in predicting body fat percentage (BF%) in some populations. However, the results have been inconsistent across populations. This study was designed to verify the validity of BAI in predicting BF% in a sample of overweight/obese adults, using dual-energy X-ray absorptiometry (DEXA) as the reference method. A cross-sectional study was conducted in 48 participants (54% women, mean age 41.0 ± 7.3 years old). DEXA was used as the "gold standard" to determine BF%. Pearson's correlation coefficient was used to evaluate the association between BAI and BF%, as assessed by DEXA. A paired samplet-test was used to test differences in mean BF% obtained with BAI and DEXA methods. To evaluate the concordance between BF% as measured by DEXA and as estimated by BAI, we used Lin's concordance correlation coefficient and Bland-Altman agreement analysis. The correlation between BF% obtained by DEXA and that estimated by BAI wasr= 0.844,p< 0.001. Pairedt-test showed a significant mean difference in BF% between methods (BAI = 33.3 ± 6.2 vs. DEXA 39.0 ± 6.1;p< 0.001). The bias of the BAI was -6.0 ± 3.0 BF% (95% CI = -12.0 to 1.0), indicating that the BAI method significantly underestimated the BF% compared to the reference method. Lin's concordance correlation coefficient was considered stronger (ρc= 0.923, 95% CI = 0.862 to 0.957). In obese adults, BAI presented low agreement with BF% measured by DEXA; therefore, BAI is not recommended for BF% prediction in this overweight/obese sample studied.
authors.affiliation: Centro de Estudios para la Medición de la Actividad Física «CEMA», Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogota, DC 111221, Colombia. robin640@hotmail.com.
authors.forename: Robinson
authors.initials: R
authors.lastname: Ramírez-Vélez
authors.affiliation: Centro de Estudios para la Medición de la Actividad Física «CEMA», Escuela de Medicina y Ciencias de la Salud, Universidad del Rosario, Bogota, DC 111221, Colombia. jorge.correa@urosario.edu.co.
authors.forename: Jorge Enrique
authors.initials: JE
authors.lastname: Correa-Bautista
authors.affiliation: Grupo de Ejercicio Físico y Deportes, Vicerrectoria de Investigaciones, Universidad Manuela Beltrán, Bogota, DC 110231, Colombia. katherine.gonzalez@docentes.umb.edu.co.
authors.forename: Katherine
authors.initials: K
authors.lastname: González-Ruíz
authors.affiliation: Grupo de Ejercicio Físico y Deportes, Vicerrectoria de Investigaciones, Universidad Manuela Beltrán, Bogota, DC 110231, Colombia. jose.vivas@docentes.umb.edu.co.
authors.forename: Andrés
authors.initials: A
authors.lastname: Vivas
authors.affiliation: Laboratorio de Ciencias de la Actividad Física, el Deporte y la Salud, Universidad de Santiago de Chile, USACH, Santiago 7500618, Chile. antonio.garcia.h@usach.cl.
authors.forename: Antonio
authors.initials: A
authors.lastname: García-Hermoso
authors.affiliation: Grupo GICAEDS, Facultad de Cultura Física, Deporte y Recreación, Universidad Santo Tomás, Bogota, DC 110311, Colombia. hectortriana@usantotomas.edu.co.
authors.forename: Hector Reynaldo
authors.initials: HR
authors.lastname: Triana-Reina
mesh_terms: D015502:Absorptiometry, Photon; D050154:Adiposity / Q000502:physiology*; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D050177:Overweight / Q000175:diagnosis*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results
keywords: adults; body composition; obesity; prediction; validity