Table 7.

Reliability and validity studies of obesity estimates

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.