Validez del porcentaje de grasa corporal por pliegues cutáneos comparado con la dilución de óxido de deuterio en escolares costarricenses
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Fecha
2018
Autores
Zamora Salas, Juan Diego
Laclé Murray, Adriana
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El objetivo del estudio fue determinar la
validez del porcentaje de grasa corporal (% GC) estimado
por la ecuación de Slaughter en escolares costarricenses.
Participaron 54 niños y 49 niñas con una edad promedio
7.8 ± 1.0 años. El óxido de deuterio (D2O) fue el método
de referencia para determinar la masa grasa (FM)
expresada como % GC. Se utilizó un análisis de regresión
lineal y prueba t para determinar la asociación y las
diferencias entre el %GC por la ecuación de Slaughter
y D2O. La concordancia entre métodos se determinó por
el coefciente de correlación de concordancia (CCC)
de Lin. La medición de acuerdo entre los métodos se
analizó mediante el procedimiento de Bland-Altman.
El % GC entre métodos fue signifcativamente
diferente en niños (26.3 ± 7.4% vs 22.4 ± 7.0%) y niñas
(33.2 ± 5.7% vs 26.1 ± 5.7%). La asociación entre
métodos no fue signifcativa en niños (R2 = 0.76,
p <0.0001) y niñas (R2 = 0.24, p <0.0001). Los gráfcos
de Bland-Altman mostraron que la ecuación de Slaughter
subestimó el % GC en 6,0% en niños y 3,5% en niñas,
en comparación con D2O. El CCC de Lin identifcó
una fuerza de concordancia pobre entre métodos, niños
ρc= 0.87 y niñas ρc= 0.56. Con los resultados se concluye
que la ecuación de Slaughter registró baja concordancia
del % GC en comparación con el D2O en escolares
costarricenses.
The aim of the study was to determine the validity of the body fat percentage (% GC) estimated by the Slaughter equation in Costa Rican school children. The sample consisted of 54 male and 49 female, mean age 7.8 ± 1.0 years. Deuterium oxide dilution (D2O) was the reference method to determine the fat mass (FM) expressed as BF%. Linear regression analyses and paired sample t-tests were used to test association and mean differences between Slaughter equation and D2O BF%. Concordance between Slaughter equation and D2O BF% was determined by Lin’s concordance correlation coefficient (CCC). Measurement of agreement between the two methods was analyzed using the BlandAltman procedure. Measurements of BF% by Slaughter equation and D2O were significantly different for boys (26.3 ± 7.4% vs 22.4 ± 7.0%) and for girls (33.2 ± 5.7% vs 26.1 ± 5.7%). Non-significant association between methods was found in males (R2 = 0.76, p <0.0001) and females (R2 = 0.24, p <0.0001). Bland-Altman plots showed that Slaughter equation underestimated the %BF in a 6.0% for boys and in a 3.5% for girls compared with D2O. Lin’s CCC identified poor strength of concordance between the two methods, for boys ρc= 0.87 and for girls ρc= 0.56. With the results we conclude that the Slaughter equation registered low agreement of BF% compared against the one obtained by D2O in Costa Rican school children.
The aim of the study was to determine the validity of the body fat percentage (% GC) estimated by the Slaughter equation in Costa Rican school children. The sample consisted of 54 male and 49 female, mean age 7.8 ± 1.0 years. Deuterium oxide dilution (D2O) was the reference method to determine the fat mass (FM) expressed as BF%. Linear regression analyses and paired sample t-tests were used to test association and mean differences between Slaughter equation and D2O BF%. Concordance between Slaughter equation and D2O BF% was determined by Lin’s concordance correlation coefficient (CCC). Measurement of agreement between the two methods was analyzed using the BlandAltman procedure. Measurements of BF% by Slaughter equation and D2O were significantly different for boys (26.3 ± 7.4% vs 22.4 ± 7.0%) and for girls (33.2 ± 5.7% vs 26.1 ± 5.7%). Non-significant association between methods was found in males (R2 = 0.76, p <0.0001) and females (R2 = 0.24, p <0.0001). Bland-Altman plots showed that Slaughter equation underestimated the %BF in a 6.0% for boys and in a 3.5% for girls compared with D2O. Lin’s CCC identified poor strength of concordance between the two methods, for boys ρc= 0.87 and for girls ρc= 0.56. With the results we conclude that the Slaughter equation registered low agreement of BF% compared against the one obtained by D2O in Costa Rican school children.
Descripción
Palabras clave
Dilución de óxido de deuterio, Escolares, Pliegues cutáneos, Porcentaje grasa corporal, Deuterium oxide dilution, Obesity, Body fat percentage, School children, Skinfold thickness
Citación
https://www.alanrevista.org/ediciones/2018/1/art-7/