Table 3. Prevalence of tooth brushing (per day) and the association with socio-demographic variables .

Tooth brushing	< 2 times a day		≥ 2 times a day
	N	%	N	%	P
Parents´ educational level
≥4 grade	2	10.5	17	89.5	0.503
5-12 grade	24	10.3	210	89.7
>12 grade	6	9.0	61	91.0
Father´s professional situation
Employed	30	9.6	283	90.4	0.521
Unemployed	4	10.3	35	89.7
Gender
Male	27	16.4	138	83.6	<0.001
Female	14	5.1	261	94.9
Age
≤ 15 years	23	10.3	200	89.7	0.252
> 15 years	15	7.9	175	92.1
Residence area
Rural	20	8.8	207	91.2	0.365
Urban	14	10.4	120	89.6
Crowding index
≤1	32	9.1	318	90.9	0.545
>1	2	11.8	15	88.2