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Activity Number: 555
Type: Topic Contributed
Date/Time: Thursday, August 6, 2009 : 8:30 AM to 10:20 AM
Sponsor: Section on Statistics in Epidemiology
Abstract - #303995
Title: Characterization of the Conicity Index in the US Adult Population
Author(s): Rodolfo Valdez*+ and Tiebin Liu
Companies: CDC and CDC
Address: Office of Public Health Genomics, Atlanta, GA, 30333,
Keywords: Waist circumference ; Body Mass Index ; Conicity Index ; Obesity
Abstract:

Abdominal obesity is associated with major chronic diseases. The measurement of abdominal fat, however, is costly. Simple measurements of abdominal girth are the low-cost alternative for epidemiologists and clinicians. Waist circumference (WC), which correlates significantly with health outcomes, is commonly used. But WC usually has a sizable correlation with body mass index (BMI), which makes difficult to estimate the added effect of abdominal obesity on a given condition. The conicity index (CI) was originally proposed to assess the contribution of WC to health risks, while accounting for overall size. For example, in U.S. adults (NHANES 1999-2004), WC is highly correlated with BMI (r=0.886), while CI is much less correlated with BMI (r=0.499) but remains highly correlated with WC (r=0.806). This presentation will discuss the properties of the CI in the current U.S. population.

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