	parameter Estimates	Standard error	Wald	P value	95% Confident Interval
	parameter Estimates	Standard error	Wald	P value	Lower	Upper
Stages of readiness to lose weight
Pre-contemplation	−5.598	0.791	50.095	<0.001	−7.148	−4.048
Contemplation	−1.370	0.269	25.985	<0.001	−1.896	−0.843
Preparation	−0.713	0.255	7.808	0.005	−1.213	−0.213
Action	2.026	0.358	32.097	<0.001	1.325	2.726
Gender
Male	0.108	0.139	0.603	0.438	−0.165	0.381
Female	0^a	.	.	.	.	.
Age
13 - 15 years old	0.134	0.140	0.925	0.336	−0.139	0.408
16 - 19 years old	0^a	.	.	.	.	.
Obesity among family members
Yes	0.143	0.156	0.840	0.359	−0.163	0.449
No	0^a		.	.	.	.
Junk foods at school canteen
Yes	−0.498	0.179	7.735	0.005*	−0.848	−0.147
No	0^a	.	.	.	.	.
TV viewing time
≤2 hours/day	0.432	0.136	10.085	0.001*	0.165	0.699
>2 hours/day	0^a	.	.	.	.	.
Activity physical mean score
Low	−0.597	0.158	14.363	<0.001*	−0.906	−0.288
High	0^a	.	.	.	.	.
Family support in physical activity
Low	−0.150	0.152	0.978	0.323	−0.449	0.148
High	0^a	.	.	.	.	.
Peer support in physical activity
Low	−0.235	0.153	2.350	0.125	−0.536	0.065
High	0^a	.	.	.	.	.
Family encouragement in healthy eating
Low	−0.373	0.145	6.621	0.010*	−0.657	−0.089
High	0^a	.	.	.	.	.
Peer encouragement in healthy eating
Low	−0.101	0.144	0.493	0.483	−0.382	0.181
High	0^a	.	.	.	.	.