Table 1.

Sample characteristics

Samples	N	Age mean (s.d.)	Age range	Male (%)	Response rate (%)	Sampling frame
Rio de Janeiro	475	7.9 (1.0)	6–11	51.4%	99%	School-based
Belo Horizonte	244	8.3 (1.7)	6–11	51.2%	NI	School-based
Natal	159	7.9 (1.2)	6–11	52.2%	NI	School-based
Porto Alegre	85	9.6 (.7)	8–11	42.4%	100%	School-based
Salvador	172	7.8 (1.4)	6–11	48.3%	NI	School-based
São Paulo	93	7.7 (.6)	7–9	52.7%	85%	School-based
Porto Alegre	247	8.8 (1.6)	6–11	61.5%	NI	Clinic-based

Note. NI = No information.