Waist-to-hip ratio cut-off points for overweight and obesity in Peruvian population
Puntos de corte de índice cintura-cadera para sobrepeso y obesidad en población peruana
DOI:
https://doi.org/10.15446/revfacmed.v73.117502Palabras clave:
Waist-Hip Ratio, Body Mass Index, Anthropometry, ROC Curve, Peru (en)Relación Cintura-Cadera, Índice de Masa Corporal, Antropometría, Curva ROC, Perú (es)
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Introduction: Waist-to-hip ratio (WHR) is an anthropometric indicator of obesity that, contrary to BMI, reflects visceral fat. The WHO recommends establishing specific cut-off points for excess weight by country and/or population group. At present, there are no cut-off points for the Peruvian population.
Objective: To establish WHR cut-off points to identify overweight and obesity in the Peruvian population.
Materials and methods: Cross-sectional analytical study conducted using data from a nationally representative sample of the adult Peruvian population (8 984 men and 11 200 women). An area under the receiver operating characteristic curve (AUC-ROC) analysis was performed to establish the WHR cut-off points for overweight and obesity in men and women according to the presence of overweight and obesity measured using BMI. The strength of the association between WHR cut-off points and BMI cut-off points was assessed using Cramér’s V correlation and calculating the Odds Ratio. Furthermore, the chi-square automatic interaction detection (CHAID) method was employed to determine the WHR values most strongly associated with nutritional status according to BMI in men and women.
Results: The AUC-ROC analysis showed that, according to the BMI cut-off points for overweight and obesity, the appropriate WHR cut-off points for overweight and obesity were 0.52 (AUC-ROC: 0.862; p<0.001) and 0.57 (0.934; p<0.001) for men and 0.54 (AUC-ROC: 0.876; p<0.001) and 0.59 (AUC-ROC: 0.933; p<0.001) for women. The association between WHR cut-off points and BMI cut-off points was stronger for obesity in both men (OR=70.46) and women (OR=61.98). Sensitivity for overweight was 87% in men and 91% in women, while these values for obesity were 97% and 96%. Based on the CHAID decision tree, the WHR values most strongly associated with overweight and obesity were 0.580-0.601 and >0.631 in men and 0.579-0.599 and >0.689 in women. Finally, the correlation between BMI and WHR was high in both men and women (Rho=0.843 and 0.861).
Conclusions: WHR showed a high correlation with BMI and is a useful tool for identifying excess weight in Peruvian adults. The proposed cut-off points showed good diagnostic performance, with high sensitivity and acceptable specificity.
Introducción. El índice cintura-cadera (ICC) es un indicador antropométrico de obesidad que, a diferencia del IMC, refleja la grasa visceral. La OMS recomienda establecer puntos de corte para exceso de peso específicos para países y/o grupos poblaciones. En la actualidad no hay puntos de corte para población peruana.
Objetivo. Establecer los puntos de corte de ICC para identificar sobrepeso y obesidad en población peruana.
Materiales y métodos. Estudio analítico transversal realizado con datos de una muestra representativa a nivel nacional de población adulta peruana (8 984 hombres y 11 200 mujeres). Se realizó un análisis de área bajo la curva de característica operativa del receptor (AUC-ROC) para establecer los puntos de corte de ICC para sobrepeso y obesidad en hombres y mujeres según la presencia de sobrepeso y obesidad determinada por el IMC. El grado de intensidad de la asociación entre los puntos de corte de ICC y los puntos de corte de IMC se evaluó mediante el coeficiente V de Cramer y el cálculo de Odds Ratio. Además, se usó el método de detección automática de interacciones de chi-cuadrado (CHAID) para determinar los valores de ICC con mayor asociación al estado nutricional según IMC en hombres y mujeres.
Resultados. El análisis de la AUC-ROC mostró que, según los puntos de corte del IMC para sobrepeso y obesidad, los puntos de corte de ICC apropiados para sobrepeso y obesidad fueron 0.52 (AUC-ROC: 0.862; p<0.001) y 0.57 (0.934; p<0.001) para hombres y 0.54 (AUC-ROC: 0.876; p<0.001) y 0.59 (AUC-ROC: 0.933; p<0.001) para mujeres. La asociación entre los puntos de corte del ICC y los del IMC fue más fuerte para la obesidad tanto en hombres (OR=70.46) como en mujeres (OR=61.98). La sensibilidad para sobrepeso fue 87% en hombres y 91% en mujeres, mientras que para obesidad fue 97% y 96%. Según el árbol de decisiones CHAID, los valores de ICC que se asociaron con mayor intensidad a sobrepeso y obesidad fueron 0.580-0.601 y >0.631 en hombres y 0.579-0.599 y >0.689 en mujeres. Finalmente, la correlación entre IMC e ICC fue alta tanto en hombres como mujeres (Rho=0.843 y 0.861).
Conclusiones. El ICC mostró alta correlación con el IMC y se presenta como una herramienta útil para identificar el exceso de peso en adultos peruanos. Los puntos de corte propuestos mostraron un buen rendimiento diagnóstico, con una alta sensibilidad y una especificidad aceptable.
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