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Nutrición Hospitalaria

On-line version ISSN 1699-5198Print version ISSN 0212-1611


DINIZ-BRITO-PINHEIRO, Antonia-Caroline et al. Sensitivity and specificity of the body mass index in the diagnosis of obesity in patients with non-dialysis chronic kidney disease: a comparison between gold standard methods and the cut-off value purpose. Nutr. Hosp. [online]. 2019, vol.36, n.1, pp.73-79.  Epub Apr 26, 2021. ISSN 1699-5198.


nutritional status is an important predictor of prognosis in chronic kidney disease (CKD), including pre-dialysis. Anthropometric measures universally used for the diagnosis of obesity in the general population may not present the same performance in individuals with CKD.


to verify the sensitivity and specificity of body mass index (BMI) in relation to the percentage of body fat (%BF) obtained by dual energy X-ray absorptiometry (DEXA) and air displacement plethysmography (PDA) for patients with non-dialysis chronic kidney disease.


BMI was obtained. DEXA and ADP were used to determine %BF and they were considered as gold standard methods.


a total of 78 patients were evaluated, with a mean age of 54.4 ± 13.9 years old. There was a higher prevalence of overweight/obesity (55.2%), according to BMI, and high %BF, according to DEXA (69.2%) and ADP (53.8%). BMI showed a statistically significant correlation with the %BF obtained by both methods and in both sexes (p < 0.05). To detect high %BF, a BMI of 25 kg/m2 had better sensitivity and specificity values for DEXA (73.3% and 66.7%, respectively) and ADP (77.3% and 52.9%, respectively) in men, and for DEXA (79.9% and 46.7%, respectively) in women. However, a BMI of 26 kg/m2 for ADP in women would be more accurate (70.0% and 73.7%, respectively).


the prevalence of patients with excess body fat was high. The conventional cut-off points for BMI were not adequate in these patients and suggested that BMI ≥ 25 kg/m2 were more accurate for diagnosing obesity.

Keywords : Body composition; Renal insufficiency; Adipose tissue; Body mass index.

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