Validity and predictors of BMI derived from self-reported height and weight among 11- to 17-year-old German adolescents from the KiGGS study

Table 4 Summary of multivariate linear regression models for the difference between self-reported and measured BMI

	Boys (n = 1 792)				Girls (n = 1 676)
	Model 1a		Model 1b		Model 1a		Model 1b
	B	p	B	p	B	p	B	p
Intercept	-0.39		-0.34		-0.25		-0.27
Age (in years)
11	0.00	ref.	0.00	ref.	0.00	ref.	0.00	ref.
12	0.18	0.250	0.23	0.140	0.31	0.025	0.32	0.022
13	0.36	0.021	0.39	0.015	0.06	0.687	0.06	0.669
14	0.49	0.002	0.49	0.002	-0.08	0.572	-0.03	0.838
15	0.34	0.031	0.31	0.058	-0.03	0.839	0.05	0.741
16	0.45	0.006	0.45	0.006	-0.20	0.160	-0.14	0.338
17	0.22	0.194	0.21	0.225	-0.07	0.647	0.02	0.884
Weight status (measured)
Underweight	0.64	0.000	not included in the model		0.37	0.028	not included in the model
Overweight	-0.87	0.000			-0.67	0.000
Normal weight	0.00	ref.			0.00	ref.
Body perception
Too thin	0.03	0.825	0.20	0.101	0.10	0.531	0.24	0.085
Too fat	-0.11	0.360	-0.46	0.000	-0.17	0.057	-0.38	0.000
Right weight	0.00	ref.	0.00	ref.	0.00	ref.	0.00	ref.
Symptoms of an eating disorder
Conspicous	-0.07	0.572	-0.15	0.231	-0.12	0.171	-0.16	0.072
Inconspicous	0.00	ref.	0.00	ref.	0.00	ref.	0.00	ref.
Parental overweight
Both	-0.08	0.487	-0.21	0.084	not significant in the univariate model		not significant in the univariate model
One	0.06	0.581	0.01	0.943
None	0.00	ref.	0.00	ref.
R ²	0.068		0.037		0.062		0.037

ISSN: 1756-0500