Participants were 602 children from 11 schools in Western Australia. One hundred and ninety-four students (53% girls) were in grade 6 (mean age 11.0 years, SD=.34), 189 students (51% girls) were in grade 7 (mean age 11.9 years, SD=.42), and 219 students (56% girls) were in grade 8 (mean age 12.9 years, SD=.49). The research had the approval of the Human Research Ethics Committee of the University of Western Australia. Parents as well as participants provided written informed consent prior to the collection of data.