Validity of self-reported height and weight among adolescents: the importance of reporting capability

Table 4 Comparisons of z-scores based on self-reported and direct measures of weight and height among 11- to 15 year old adolescents by response

	N	z-score/self-reported		z-score/direct		Difference for z-score
		Mean	SD	Mean	SD	Mean	SD	95% CI	P value*
Boys	791	−0.22	1.03	−0.08	1.01	−0.14	0.70	−0.19;- 0.09	<0.0001
Girls	815	−0.40	0.94	−0.12	0.95	−0.28	0.53	−0.31; -0.24	<0.0001
BMI Response capability**
Boys
High	419	−0.28	1.00	−0.11	0.99	−0.18	0.62	−0.24; -0.12	<0.0001
Low	360	−0.16	1.06	−0.04	1.06	−0.12	0.80	−0.20; -0.04	0.0053
Girls
High	458	−0.40	0.95	−0.17	0.93	−0.23	0.45	−0.27; -0.19	<0.0001
Low	343	−0.39	0.93	−0.05	0.97	−0.34	0.61	−0.41; -0.28	<0.0001

* Paired T-test.
**High combined response capability = measured recently + high recall ability for height + weighed recently + high recall ability for weight, Low combined response capability = remaining categories.

ISSN: 1471-2288