Self-estimated BMI, but not self-perceived body size, accurately identifies unhealthy weight in US adults.

All p -values were < 0.001 unless stated otherwise. Obese participants were less likely to self-perceive as ‘too large’ if they were followed up more recently (OR for accurate perception 0.979 per year) or if they were older (OR 1.01 per year) or male (OR 0.326.) There was also a clear trend of increasing accuracy in weight perception across income categories: obese people earning below the poverty line had an OR of 0.608 for detection, while the next categories had ORs of 0.734, 1 (reference), 1.31, 2.21, and 1.83 (all pairwise p -values ≤0.05.) All ethnic groups were at higher risk of misperception than was the European-American reference group: odds ratios were 0.356, 0.730, and 0.791 (pairwise p > 0.10) for African-American, Hispanic, and ‘other race’ respectively.

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