Table 1.

Sample characteristics according to gender, age group and city of residence

	n	%
Gender
Boys	422	51
Girls	409	49
Age - Boys
3 to 6 years	130	31
7 to 10 years	97	23
11 to 17 years	195	46
Age - Girls
3 to 6 years	127	31
7 to 10 years	93	23
11 to 17 years	189	46
Cities
Belo Horizonte	156	19
Porto Alegre	161	20
Recife	171	20
Rio de Janeiro	181	21
São Paulo	162	20