Table 3. Demographic characteristics based on study groups .

Variables	Control		Intervention		P value
	Number	Percent	Number	Percent
Mother education					0.322
>Diploma	4	6.25	3	4.60
<Diploma	60	93.75	61	95.30
Father education					0.683
>Diploma	7	10.93	9	14.06
<Diploma	57	89.06	61	85.90
Father’s occupation					0.530
Employee	62	96.87	59	92.18
Unemployed	2	3.12	5	5.81
Mother’s occupation					0.921
Employee	21	32.81	25	39.06
Housewife	43	67.18	39	60.93
School grade					0.732
10	11	17.18	12	18.75
11	21	23.81	20	31.25
12	15	23.43	16	25.00
Pre-University	17	25.56	16	25.00
Family income $					0.381
<190	43	67.18	44	68.75
>190	21	32.81	20	31.55
Field of study					0.990
Mathematic	8	12.50	10	15.16
Experimental Sciences	13	20.31	11	17.18
Humanities	11	17.18	11	17.18
Technical	15	23.43	17	26.50
Kar va Danesh a	17	26.56	15	23.40
Place of residence					0.982
Downtown areas	32	50.00	34	53.12
Suburbs	32	50.00	30	46.80
living with parents					0.751
With two parents	57	89.06	54	84.30
With one of the parents	7	10.93	10	15.60

^a A new major in Iranian high schools