The inter-operator variability in measuring waist circumference and its potential impact on the diagnosis of the metabolic syndrome

Postgraduate Medical Journal
V F PanoulasM Labib

Abstract

The International Diabetes Federation (IDF) has proposed ethnicity specific cut-off values for waist circumference, as an essential criterion for the diagnosis of the metabolic syndrome (MetS). However, before introducing waist circumference measurement as part of the clinical examination, or an obligatory criterion for MetS, it is important to ensure that the measurement is reliable and reproducible. The inter- and intra-operator variability in measuring waist circumference was assessed in a preliminary study of 10 health professionals and the inter-operator variability in clinical practice was assessed in a study of 102 patients. Repeated measures analysis of variance (ANOVA) was used to assess the significance of the inter- and intra-operator variability. Intra-operator variability was not found to be significant in the preliminary study (F = 0.15, p = 0.764). However, the inter-operator variability was significant in both studies (preliminary: F = 4.16, p<0.001, clinical practice study: F = 14.06, p<0.001). In clinical practice, this could lead to disagreement among operators regarding the presence of central obesity in 9% of the patients. After giving written instructions on how to measure waist circumference, the coeffici...Continue Reading

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