2.1. Participants
The participants in this sample were the same as those involved
in a previous study that examined the prevalence of ADHD in
Malaysian primary school children (Gomez and Hafetz, 2011).
Since details of the method were provided in that paper, only a
brief description of the method is provided here. Briefly, 934
parents and teachers from the State of Johor in Malaysia
participated in this study. These respondents provided ratings
for 436 boys and 496 girls, who were 6 and 12 years of age. The
children were from fourteen randomly selected schools. There was
no significant difference for age between boys and girls, and their
ethnic background and fathers’ occupational levels did not differ
significantly from the general Malaysian population.