Table 1.

Cross-Classification of Measured BMI and Self-Reported BMI for Standard BMI Categories*

	Measured BMI:
Self Reported BMI:	Under-weight < 18.5	Normal Weight 18.5 < 25	Over- weight 25 < 30	Obese 30 < 40	Extreme Obesity 40+
< 18.5	56.5%	1.5%	0.1%	0.0%	0.0%
18.5 < 25	43.5%	90.4%	16.0%	0.8%	0.0%
25 < 30	0.0%	8.0%	78.9%	19.0%	0.3%
30 < 40	0.0%	0.1%	5.1%	78.5%	27.8%
40+		0.0%	0.0%	1.6%	71.9%
N = 15161; Population Size: 193,275,651

* Measured BMI was calculated using physical measurements of height and weight;

Self-reported BMI was calculated using self-reported height and weight.

Source: National Health and Nutrition Examination Survey, 2001-2006. National Center for Health Statistics, CDC