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


METHODS
We analyzed data from 10,639 National Health and Nutrition Education Study III participants > or =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.


CONCLUSIONS
The accuracy of self-reported BMI is sufficient for epidemiological studies using disease biomarkers, although inappropriate for precise measures of obesity prevalence.
McAdams
Mara A
MA
Department of Epidemiology, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115, USA.
Van Dam
Rob M
RM
Hu
Frank B
FB
D000328:Adult; D001741:Black or African American; D015415:Biomarkers / Q000032:analysis*; D001786:Blood Glucose / Q000032:analysis; D001794:Blood Pressure / Q000502:physiology; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000032:analysis; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D020738:Leptin / Q000097:blood; D008055:Lipids / Q000097:blood; D008297:Male; D017058:Mexican Americans; D008875:Middle Aged; D009749:Nutrition Surveys; D009765:Obesity / Q000097:blood* / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D015995:Prevalence; D012650:Self Disclosure; D014481:United States / Q000453:epidemiology; D044465:White People
D015415:Biomarkers; D001786:Blood Glucose; D020738:Leptin; D008055:Lipids; D002097:C-Reactive Protein