Table 3.

Performance of self-reported BMI, self-reported BMI using the new cut-offs and the predictive regression model in the validation sample

	Self reported BMI	Using the new cut-offs	Regression model
% correctly classified (95% CI)	76.2% (73.4-78.9)	82.5% (79.9-84.8)	84.6% (82.2-86.8)
Weighted kappa (95% CI)	0.79 (0.77-0.82)	0.85 (0.82-0.87)	0.86 (0.84-0.88)
ROC Area Obesity (95% CI)	0.87 (0.84-0.89)	0.91 (0.89-0.93)	0.92 (0.89-0.94)
ROC Area Overweight (95% CI)	0.87 (0.85-0.89)	0.91 (0.89-0.93)	0.90 (0.88-0.92)