Feasibility and validity of a statistical adjustment to reduce self-report bias of height and weight in wave 1 of the Add Health study

Table 4 Weight status classification comparisons between measured and corrected BMI by sex at Wave 2

	Measured BMI weight status W2 (%)
Corrected BMI weight status W2	UW	HW	OW	OB	Total
Male
UW	1.3	0.6	0.0	0.0	1.9
HW	2.9	64.9	2.8	0.3	71.1
OW	0.0	3.2	8.7	2.0	13.8
OB	0.1	0.3	1.5	11.3	13.2
Total (n = 6717)	4.3	69.1	13.0	13.6	100.0
Female
UW	0.9	0.5	0.0	0.0	1.4
HW	3.1	67.3	2.9	0.2	73.5
OW	0.0	3.2	9.6	2.0	14.8
OB	0.0	0.2	1.4	8.7	10.3
Total (n = 6933)	4.0	71.2	13.9	10.9	100.0
n = 13,650

Bolded values on the diagonal represent the percent of cases that were jointly classified in the same weight status category by both methods (measured and corrected BMI). Note that the row totals show the “true” weight status rates. Italicized values above the diagonals represent the weight status misclassification rate among those who underestimated their weight status; such misclassification was a total of 5.7 % for males and 5.6 % for females after correction, obtained by summing misclassification rates above the diagonals for males and for females
UW underweight, HW healthy weight, OW overweight, OB obesity, BMI body mass index

ISSN: 1471-2288