A stratified multi-stage random sampling was used to select the participants in this study. According to the Office of the Basic Education Commission, the Educational Service Area in Bangkok Metropolitan can be divided into 3 areas: Bangkok Educational Service Area Offices (BESAO) 1, 2 and 3. Accordingly, three Area offices were selected for participation. Two schools were randomly selected from BESAO. In all, six schools were chosen and from each of these two classrooms from grades 7, 8 and 9 were randomly selected to be included, a total of 36
classrooms. However, when data were collected, some schools had small class sizes (having less than 10-15 female students per classroom), thus additional classrooms were recruited. The total sample was 528.
A stratified multi-stage random sampling was used to select the participants in this study. According to the Office of the Basic Education Commission, the Educational Service Area in Bangkok Metropolitan can be divided into 3 areas: Bangkok Educational Service Area Offices (BESAO) 1, 2 and 3. Accordingly, three Area offices were selected for participation. Two schools were randomly selected from BESAO. In all, six schools were chosen and from each of these two classrooms from grades 7, 8 and 9 were randomly selected to be included, a total of 36 classrooms. However, when data were collected, some schools had small class sizes (having less than 10-15 female students per classroom), thus additional classrooms were recruited. The total sample was 528.
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