Accuracy of body mass index for age to diagnose obesity in Mexican schoolchildren.

Abstract:

OBJECTIVE:To compare the accuracy of three BMI-forage references (World Health Organization reference, WHO; the updated International Obesity Task Force reference, IOTF; and Centers for Disease Control and Prevention (CDC) growth charts) to diagnose obesity in Mexican children. METHODS:A convenience sample of Mexican schoolchildren (n = 218) was assessed. The gold standard was the percentage of body fat estimated by deuterium dilution technique. Sensitivity and specificity of the classical cutoff point of BMI-for-age to identify obesity (i.e. > 2.00 standard deviation, SD) were estimated. The accuracy (i.e. area under the curve, AUC) of three BMI-for-age references for the diagnosis of obesity was estimated with the receiver operating characteristic (ROC) curves method. The optimal cutoff point (OCP) was determined. RESULTS:The cutoff points to identify obesity had low (WHO reference: 57.6%, CDC: 53.5%) to very low (IOTF reference: 40.4%) sensitivities, but adequate specificities (91.6%, 95.0%, and, 97.5%, respectively). The AUC of the three references were adequate (0.89). For the IOTF reference, the AUC was lower among the older children. The OCP for the CDC reference (1.24 SD) was lower than the OCP for WHO (1.53 SD) and IOTF charts (1.47 SD). CONCLUSIONS:The classical cutoff point for obesity has low sensitivity--especially for the IOTF reference. The accuracy of the three references was similar. However, to obtain comparable diagnosis of obesity different cutoff points should be used depending of the reference. :Objetivo: comparar la exactitud de tres referencias del IMC para la edad (de la Organización Mundial de la Salud, OMS; de la International Obesity Task Force, IOTF; y de los Centros para el Control y Prevención de Enfermedades (CDC) de las tablas de crecimiento) para diagnosticar obesidad en niños mexicanos. Métodos: se evaluó una muestra por conveniencia de escolares de la ciudad de México (n = 218). El estándar de oro fue el porcentaje de grasa corporal estimado por la técnica de dilución de deuterio. Se estimaron la sensibilidad y la especificidad del punto de corte clásico del IMC para la edad para identificar obesidad (i.e. > 2.0 desviaciones estándar, DE). La exactitud (i.e., área bajo la curva, ABC) de las tres referencias del IMC para el diagnóstico de la obesidad se estimó con el método de curvas ROC. Se identificó el punto de corte óptimo (PCO). Resultados: los puntos de corte para identificar obesidad tuvieron baja (OMS: 57.6% y CDC: 53.5%) o muy baja (IOTF referencia: 40,4%) sensibilidad, pero especificidades adecuadas (91.6%, 95.0% y 97.5%, respectivamente). El ABC de las tres referencias fueron adecuadas (0.89). Entre los niños mayores la referencia de la IOTF tuvo el menor ABC. El PCO para la referencia de los CDC (1.24 DE) fue menor que el PCO para la de la OMS (1.53 DE) y la de la IOTF (1.47 DE). Conclusiones: el punto de corte clásico para la obesidad tiene baja sensibilidad, especialmente para la referencia de la IOTF. La exactitud de las tres referencias fue similar. Sin embargo, para obtener el diagnóstico comparable de obesidad en diferentes puntos de corte se debe utilizar en función de la referencia seleccionada.

journal_name

Nutr Hosp

journal_title

Nutricion hospitalaria

authors

Mendoza Pablo PA,Valdés J,Ortiz-Hernández L

doi

10.3305/nh.2015.31.6.8639

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

2668-75

issue

6

eissn

0212-1611

issn

1699-5198

journal_volume

31

pub_type

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