Table 1. Socio-demographic characteristics of the study sample (n=264 pupils).

	Variable	N	%
Sex	Male	93	35.2
	Female	171	64.8
Age	≤ 6–8 years	63	23.9
	≤9–12 years	201	76.1
	Mean ± SD		8.85±1.18
Father's level of education	Illiterate	192	72.7
	Can read and write	0	0
	Diploma	72	27.3
	University	0	0
Father's work	Manual	212	80.3
	Professional	52	19.7
Mother's level of education	Illiterate	218	81.8
	Can read and write	0	0
	Diploma	48	18.2
	University	0	0
Mother's work	Manual	240	90.9
	Professional	24	9.1