Table 1. Frequency distribution of participants according to demographic characteristics
Variables		Number (individuals)	Percent (%)
Education center	Public	663	78
	Private	187	22
Study field	Math	80	9.4
	Experimental	185	21.8
	Humanities	153	18
	Vocational	63	7.4
	First .m	369	43.4
Area or residence	City	816	96
	Suburbs	34	4
Ethnicity	Guilanian	732	86.1
	Other	118	13.9
Number of family members	2	21	2.5
	3	200	23.5
	4	466	54.8
	5	120	14.1
	6- and more	4	5.1
Child's grade	1	485	57.1
	2	240	28.2
	3	90	10.6
	4- to up	35	4.1
Father's level of education	Illiterate	15	1.8
	Primary	95	11.2
	Middle school degree	265	31.2
	Diploma	363	42.7
	University educated	112	13.2
Father's job	Unemployed	16	1.9
	Worker	79	9.3
	Farmer	17	2
	Clerk	198	23.3
	Self-employed	540	63.5
Mother's level of education	Illiterate	16	1.9
	Primary	102	12
	Middle school degree	258	30.4
	Diploma	394	46.4
	University educated	80	9.4
Mother's job	Housewife	731	86
	Worker and farmer	10	1.2
	Clerk	40	4.7
	Self-employed	69	8.1
Family income	Less than 1 million	213	25.1
	1- 2 million	432	50.8
	More than 2 million	205	24.1
Living with parents	Yes	803	94.5
	No	47	5.5