Table 2.

Factors associated with BMI z-score of school adolescents

Variables	Univariate analysis			Multivariate analysis
	Crude β	95% CI	P-value	Adjusted βa	95% CI	P-value
Mother’s BMI	0.082	0.06, 0.104	<0.001	0.069	0.038, 0.1	<0.001
Father’s BMI	0.082	0.059, 0.106	<0.001	0.073	0.044, 0.102	<0.001
Birth weight	0.445	0.271, 0.618	<0.001	0.357	0.123, 0.59	0.003
Household size	-0.057	-0.099, -0.015	0.007	-0.085	-0.158, -0.012	0.022
Dairy products intake	0.139	0.035, 0.242	0.009	0.194	0.013, 0.375	0.036

^aAdjusted regression coefficient; Forward MLR applied. Model assumptions are fulfilled. There were no interactions amongst independent variables. No multicolinearity detected. Coefficient of determination (R²) = 0.131; Final model equation [Y = β₀ + β₁ (X₁) + β₂ (X₂) + β₃ (X₃)…… + β_i (X_i)]

BMI z − score =  − 4.125 + 0.073 (father ’ s BMI) + 0.069 (mother ’ s BMI) + 0.357 (Birth weight) – 0.085 (household number) + 0.194 (dairy products intake)