Table 3.

Hierarchical stepwise regression analysis on self-efficacy

Blocks of variables	Full sample (n = 321)		Boys (n = 160)			Girls (n = 161)
	Variable	β	Variable	β	Variable	β
Demographic variables	R2 = 0.055 sex (male) BMI percentile	0.189** –0.163**	R2 = 0.053 BMI percentile	–0.230**	R2 = 0.030 age	–0.175**
Peer network	ΔR2 = 0.132** peer network	0.365**	ΔR2 = 0.191** peer network	0.439**	ΔR2 = 0.129** peer network	0.379**
Parental exercise level	ΔR2 = 0.035* parental exercise level	0.193**			ΔR2 = 0.086** parental exercise level	0.300**
Total R2	0.433		0.244		0.246

β = standardized regression coefficient.

^*p < 0.05,

^**p< 0.01.