Comparison of self-reported and measured BMI as correlates of disease markers in U.S. adults

Mara Ann McAdams Demarco, Rob M. Van Dam, Frank B. Hu

Research output: Contribution to journalArticle

Abstract

Objective: The purpose of this study is to evaluate the validity of BMI based on self-reported data by comparison with technician-measured BMI and biomarkers of adiposity. Research Methods and Procedures: We analyzed data from 10,639 National Health and Nutrition Education Study III participants ≥20 years of age to compare BMI calculated from self-reported weight and height with BMI from technician-measured values and body fatness estimated from bioelectrical impedance analysis in relation to systolic blood pressure, fasting blood levels of glucose, high-density lipoprotein-cholesterol, triglycerides, C-reactive protein, and leptin. Results: BMI based on self-reported data (25.07 kg/m2) was lower than BMI based on technician measurements (25.52 kg/m2) because of underreporting weight (-0.56 kg; 95% confidence interval, -0.71, -0.41) and overreporting height (0.76 cm; 95% confidence interval, 0.64, 0.88). However, the correlations between self-reported and measured BMI values were very high (0.95 for whites, 0.93 for blacks, and 0.90 for Mexican Americans). In terms of biomarkers, self-reported and measured BMI values were equally correlated with fasting blood glucose (r = 0.43), high-density lipoprotein-cholesterol (r = -0.53), and systolic blood pressure (r = 0.54). Similar correlations were observed for both measures of BMI with plasma concentrations of triglycerides and leptin. These correlations did not differ appreciably by age, sex, ethnicity, or obesity status. Correlations for percentage body fat estimated through bioelectrical impedance analysis with these biomarkers were similar to those for BMI. Discussion: The accuracy of self-reported BMI is sufficient for epidemiological studies using disease biomarkers, although inappropriate for precise measures of obesity prevalence.

Original languageEnglish (US)
Pages (from-to)188-196
Number of pages9
JournalObesity
Volume15
Issue number1
DOIs
StatePublished - Jan 2007
Externally publishedYes

Fingerprint

Biomarkers
Blood Pressure
Leptin
Electric Impedance
HDL Cholesterol
Blood Glucose
Fasting
Triglycerides
Obesity
Confidence Intervals
Weights and Measures
Adiposity
Health Education
C-Reactive Protein
Adipose Tissue
Epidemiologic Studies
Research

Keywords

  • Bioelectrical impedance analysis
  • BMI
  • National health and nutrition education study III
  • Self-reported weight

ASJC Scopus subject areas

  • Endocrinology
  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

Cite this

Comparison of self-reported and measured BMI as correlates of disease markers in U.S. adults. / McAdams Demarco, Mara Ann; Van Dam, Rob M.; Hu, Frank B.

In: Obesity, Vol. 15, No. 1, 01.2007, p. 188-196.

Research output: Contribution to journalArticle

@article{837e15ae0f574285a0973d29a877ad3f,
title = "Comparison of self-reported and measured BMI as correlates of disease markers in U.S. adults",
abstract = "Objective: The purpose of this study is to evaluate the validity of BMI based on self-reported data by comparison with technician-measured BMI and biomarkers of adiposity. Research Methods and Procedures: We analyzed data from 10,639 National Health and Nutrition Education Study III participants ≥20 years of age to compare BMI calculated from self-reported weight and height with BMI from technician-measured values and body fatness estimated from bioelectrical impedance analysis in relation to systolic blood pressure, fasting blood levels of glucose, high-density lipoprotein-cholesterol, triglycerides, C-reactive protein, and leptin. Results: BMI based on self-reported data (25.07 kg/m2) was lower than BMI based on technician measurements (25.52 kg/m2) because of underreporting weight (-0.56 kg; 95{\%} confidence interval, -0.71, -0.41) and overreporting height (0.76 cm; 95{\%} confidence interval, 0.64, 0.88). However, the correlations between self-reported and measured BMI values were very high (0.95 for whites, 0.93 for blacks, and 0.90 for Mexican Americans). In terms of biomarkers, self-reported and measured BMI values were equally correlated with fasting blood glucose (r = 0.43), high-density lipoprotein-cholesterol (r = -0.53), and systolic blood pressure (r = 0.54). Similar correlations were observed for both measures of BMI with plasma concentrations of triglycerides and leptin. These correlations did not differ appreciably by age, sex, ethnicity, or obesity status. Correlations for percentage body fat estimated through bioelectrical impedance analysis with these biomarkers were similar to those for BMI. Discussion: The accuracy of self-reported BMI is sufficient for epidemiological studies using disease biomarkers, although inappropriate for precise measures of obesity prevalence.",
keywords = "Bioelectrical impedance analysis, BMI, National health and nutrition education study III, Self-reported weight",
author = "{McAdams Demarco}, {Mara Ann} and {Van Dam}, {Rob M.} and Hu, {Frank B.}",
year = "2007",
month = "1",
doi = "10.1038/oby.2007.504",
language = "English (US)",
volume = "15",
pages = "188--196",
journal = "Obesity",
issn = "1930-7381",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Comparison of self-reported and measured BMI as correlates of disease markers in U.S. adults

AU - McAdams Demarco, Mara Ann

AU - Van Dam, Rob M.

AU - Hu, Frank B.

PY - 2007/1

Y1 - 2007/1

N2 - Objective: The purpose of this study is to evaluate the validity of BMI based on self-reported data by comparison with technician-measured BMI and biomarkers of adiposity. Research Methods and Procedures: We analyzed data from 10,639 National Health and Nutrition Education Study III participants ≥20 years of age to compare BMI calculated from self-reported weight and height with BMI from technician-measured values and body fatness estimated from bioelectrical impedance analysis in relation to systolic blood pressure, fasting blood levels of glucose, high-density lipoprotein-cholesterol, triglycerides, C-reactive protein, and leptin. Results: BMI based on self-reported data (25.07 kg/m2) was lower than BMI based on technician measurements (25.52 kg/m2) because of underreporting weight (-0.56 kg; 95% confidence interval, -0.71, -0.41) and overreporting height (0.76 cm; 95% confidence interval, 0.64, 0.88). However, the correlations between self-reported and measured BMI values were very high (0.95 for whites, 0.93 for blacks, and 0.90 for Mexican Americans). In terms of biomarkers, self-reported and measured BMI values were equally correlated with fasting blood glucose (r = 0.43), high-density lipoprotein-cholesterol (r = -0.53), and systolic blood pressure (r = 0.54). Similar correlations were observed for both measures of BMI with plasma concentrations of triglycerides and leptin. These correlations did not differ appreciably by age, sex, ethnicity, or obesity status. Correlations for percentage body fat estimated through bioelectrical impedance analysis with these biomarkers were similar to those for BMI. Discussion: The accuracy of self-reported BMI is sufficient for epidemiological studies using disease biomarkers, although inappropriate for precise measures of obesity prevalence.

AB - Objective: The purpose of this study is to evaluate the validity of BMI based on self-reported data by comparison with technician-measured BMI and biomarkers of adiposity. Research Methods and Procedures: We analyzed data from 10,639 National Health and Nutrition Education Study III participants ≥20 years of age to compare BMI calculated from self-reported weight and height with BMI from technician-measured values and body fatness estimated from bioelectrical impedance analysis in relation to systolic blood pressure, fasting blood levels of glucose, high-density lipoprotein-cholesterol, triglycerides, C-reactive protein, and leptin. Results: BMI based on self-reported data (25.07 kg/m2) was lower than BMI based on technician measurements (25.52 kg/m2) because of underreporting weight (-0.56 kg; 95% confidence interval, -0.71, -0.41) and overreporting height (0.76 cm; 95% confidence interval, 0.64, 0.88). However, the correlations between self-reported and measured BMI values were very high (0.95 for whites, 0.93 for blacks, and 0.90 for Mexican Americans). In terms of biomarkers, self-reported and measured BMI values were equally correlated with fasting blood glucose (r = 0.43), high-density lipoprotein-cholesterol (r = -0.53), and systolic blood pressure (r = 0.54). Similar correlations were observed for both measures of BMI with plasma concentrations of triglycerides and leptin. These correlations did not differ appreciably by age, sex, ethnicity, or obesity status. Correlations for percentage body fat estimated through bioelectrical impedance analysis with these biomarkers were similar to those for BMI. Discussion: The accuracy of self-reported BMI is sufficient for epidemiological studies using disease biomarkers, although inappropriate for precise measures of obesity prevalence.

KW - Bioelectrical impedance analysis

KW - BMI

KW - National health and nutrition education study III

KW - Self-reported weight

UR - http://www.scopus.com/inward/record.url?scp=33846889975&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846889975&partnerID=8YFLogxK

U2 - 10.1038/oby.2007.504

DO - 10.1038/oby.2007.504

M3 - Article

VL - 15

SP - 188

EP - 196

JO - Obesity

JF - Obesity

SN - 1930-7381

IS - 1

ER -