Table 3 Mean discrepancy scores between self-reported and measured BMI (kg m⁻²) based on NHANES 1988–1994 and NHANES 2005–2008 by BMI categories (population estimates)

	Mean	95% CI		Mean difference: 88/94-05/08	P-value
Unadjusted
NHANES 1988–1994	−0.564	−0.615	−0.513
NHANES 2005–2008	−0.644	−0.694	−0.593	0.080	<0.031
BMI <18.5
NHANES 1988–1994	0.747	0.565	0.930
NHANES 2005–2008	0.538	0.375	0.700	0.210	<0.092
BMI 18.5<25
NHANES 1988–1994	−0.065	−0.120	−0.010
NHANES 2005–2008	0.000	−0.063	0.063	−0.065	<0.126
BMI 25<30
NHANES 1988–1994	−0.618	−0.669	−0.566
NHANES 2005–2008	−0.588	−0.657	−0.519	−0.030	<0.493
BMI 30<35
NHANES 1988–1994	−1.267	−1.414	−1.121
NHANES 2005–2008	−1.018	−1.105	−0.931	−0.249	<0.001
BMI 35<40
NHANES 1988–1994	−1.791	−2.033	−1.549
NHANES 2005–2008	−1.604	−1.767	−1.441	−0.186	<0.208
BMI 40+
NHANES 1988–1994	−3.487	−3.999	−2.974
NHANES 2005–2008	−2.258	−2.610	−1.905	−1.229	<0.001

Abbreviations: BMI, body mass index; CI, confidence interval; NHANES, National Health and Nutrition Examination Survey.

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