Accuracy of BMI and waist circumference cut-off points to predict obesity in older adults.

Autor:	Silveira EA; Faculdade de Medicina, Universidade Federal de Goiás. Av. Primeira Avenida s/nº, Setor Leste Universitário. 74000-000, Goiânia, GO, Brasil. erikasil@terra.com.br., Pagotto V; Faculdade de Enfermagem, Universidade Federal de Goiânia. Goiânia, GO, Brasil., Barbosa LS; Faculdade de Medicina, Universidade Federal de Goiás. Av. Primeira Avenida s/nº, Setor Leste Universitário. 74000-000, Goiânia, GO, Brasil. erikasil@terra.com.br., Oliveira C; Department of Epidemiology and Public Health, University College. London UK., Pena GDG; Faculdade de Medicina, Universidade Federal de Uberlândia. Uberlândia, MG, Brasil., Velasquez-Melendez G; Escola de Enfermagem, Universidade Federal de Minas Gerais. Belo Horizonte, MG, Brasil.
Jazyk:	Portuguese; English
Zdroj:	Ciencia & saude coletiva [Cien Saude Colet] 2020 Mar; Vol. 25 (3), pp. 1073-1082. Date of Electronic Publication: 2018 Jul 21.
DOI:	10.1590/1413-81232020253.13762018
Abstrakt:	The main objectives were to analyse the validity and accuracy of Body Mass Index (BMI) and Waist Circumference (WC) to evaluate obesity by excess of body fat in older adults and to identify more adequate cut-off points for this age group. The recommended cut-off points for BMI (25, 27 or 30 kg/m2) and WC (≥ 102 cm for men and ≥ 88 cm for women or ≥ 90cm for men and ≥ 80 cm for women) were compared to the total body densitometry. BF was defined by a value higher than the 90th percentile. Out of the 132 participants, 61% were women and aged between 60 and 91 years. The recommended cut-off points of BMI ≥ 25kg/m2 and BMI ≥ 27 kg/m2 showed similar performances. BMI ≥ 30 kg/m2 showed high specificity but low sensitivity to identify BF in men and better performance in women. Conventional WC cut-off points showed low sensitivity and specificity. Based on our analyses, new cut-off points for BMI (25 kg/m2 for men and 26.6 kg/m2 for women) and WC (98.8 cm for men and 77.8cm for women) were proposed. The new cut-off points showed sensitivity and specificity values > 74% and accuracy > 76%. The areas under the curve (ROC) were > 0.86. The new BMI and WC cut-off points proposed in the present study for the diagnosis of obesity in older adults showed the best levels of sensitivity and specificity for this age group.
Databáze:	MEDLINE
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