Cognitive ability and self-control in relation to dietary habits, physical activity and bodyweight in adolescents

Table 4 Hierarchal regression for control-variables, self-control and psychometric cognitive ability predicting different health behaviours.

	Physical activity			BMI
Variables	B	SE B	β	B	SE B	β
Step 1: Control variables added
Age	-.15	.14	-.07	.35	.17	.15*
Gender	.69	.29	.17*	.61	.35	.13
Own house	.11	.50	.02	.00	.59	.00
Family income	.15	.28	.05	.19	.33	.05
Kind of house	.29	.16	.14	-.25	.19	-.10
Occupation primary wage earner	-.02	.15	-.01	.01	.18	.00
Step 2: Cognitive ability added
Age	-.14	.14	-.07	.35	.17	.14*
Sex	.72	.29	.18*	.59	.35	.12
Own or rent house	-.01	.49	.00	.09	.60	.01
Family income	.12	.27	.04	.21	.33	.05
Kind of house	.30	.16	.14	-.26	.19	-.10
Occupation primary wage earner	-.04	.15	-.02	.03	.18	.01
Cognitive ability	.05	.02	.16*	-.03	.02	-.09
Step 3: Self-control added
Age	-.14	.14	-.07	.34	.17	.14*
Sex	.73	.28	.18*	.59	.35	.12
Own or rent the house	.10	.49	.02	-.03	.59	.00
Family income	.08	.27	.02	.25	.33	.06
Kind of house	.34	.16	.16*	-.30	.19	-.12
Occupation primary wage earner	-.05	.15	-.03	.03	.18	.01
Cognitive ability	.04	.02	.14*	-.03	.02	-.08
Self-control	.03	.01	.20**	-.03	.01	-.17*

For physical activity, R² = .07 (p < .05) for step 1; ΔR² = .02(p < .05) for step 2; ΔR² = .04 (p < .05) for step 3.
For BMI, R² = .05 (p > .05) for step 1; ΔR² = .01 (ns) for step 2; ΔR² = .03 (p< .05) for step 3. * p < .05; ** p < .01. ^a p = .06

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