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Table 7 Reliability and validity studies of obesity estimates

From: A systematic review of publications assessing reliability and validity of the Behavioral Risk Factor Surveillance System (BRFSS), 2004–2011

First author (year) Focus of research Research findings
Fahimi (2008) Comparison of BRFSS, NHANES, and NHIS measures of height and weight NHIS and BRFSS height measures differed by .14 inches
NHIS and BRFSS weight measures differed by 1.2%
BRFSS and NHANES height measures were statistically identical
BRFSS weight measures fell between measures taken by NHANES (self-reports) and NHIS
Ezzati (2006) Weighting BRFSS self-reports of height and weight by NHANES to correct for bias/ underestimation BRFSS underestimation from 1999–2002 averaged 5.9%, but could be corrected by weighting
Yun (2006) Weighting BRFSS self-reports of height and weight by NHANES to correct for bias/ underestimation by race, gender and age BRFSS underestimated prevalence of obesity and overweight groups by 9.5 and 5.7 percentage points, respectively, Estimates for femalesaged 20–39 differed from NHANES physical measures most often.