From the eight secondary schools contacted and met the
criteria stated above, two schools were purposively selected to
participate in the study. The two schools chosen were those
that have equal number of students (40 each) in their JSS year
two classes. Thus, a sample of eighty (80) JSS year two
students (48 boys and 32 girls) participated in the study. The
two classes were then assigned randomly into an experimental
class and a control class. In the case of school with more than one arm or class for JSS year two students, one arm or class
was randomly selected. The median age of participants was 13
years.