Cardiometabolic Risk Assessments by Body Mass Index z-Score or Waist-to-Height Ratio in a Multiethnic Sample of Sixth-Graders. (14th July 2014)

• Record Type: Journal Article
• Authors: Kahn, Henry S.; El ghormli, Laure; Jago, Russell; Foster, Gary D.; McMurray, Robert G.; Buse, John B.; Stadler, Diane D.; Treviño, Roberto P.; Baranowski, Tom; HEALTHY Study Group,
• Other Names: Huang Terry Academic Editor.
• Is Part Of: Journal of obesity. Volume 2014(2014)
• Publication Date: 2014-07-14
• Subjects: Obesity -- Periodicals; Obesity; Obesity; Electronic journals; Periodicals; Periodicals; 616.398
• DOI: 10.1155/2014/421658
• Languages: English
• ISSNs: 2090-0708

Abstract

Abstract : Convention defines pediatric adiposity by the body mass indexz -score (BMIz) referenced to normative growth charts. Waist-to-height ratio (WHtR) does not depend on sex-and-age references. In the HEALTHY Study enrollment sample, we compared BMIz with WHtR for ability to identify adverse cardiometabolic risk. Among 5, 482 sixth-grade students from 42 middle schools, we estimated explanatory variations (R 2 ) and standardized beta coefficients of BMIz or WHtR for cardiometabolic risk factors: insulin resistance (HOMA-IR), lipids, blood pressures, and glucose. For each risk outcome variable, we prepared adjusted regression models for four subpopulations stratified by sex and high versus lower fatness. For HOMA-IR, R 2 attributed to BMIz or WHtR was 19%–28% among high-fatness and 8%–13% among lower-fatness students.R 2 for lipid variables was 4%–9% among high-fatness and 2%–7% among lower-fatness students. In the lower-fatness subpopulations, the standardized coefficients for total cholesterol/HDL cholesterol and triglycerides tended to be weaker for BMIz (0.13–0.20) than for WHtR (0.17–0.28). Among high-fatness students, BMIz and WHtR correlated with blood pressures for Hispanics and whites, but not black boys (systolic) or girls (systolic and diastolic). In 11-12 year olds, assessments by WHtR can provide cardiometabolic risk estimates similar to conventional BMIz without requiring reference to a normative growth chart.