This large number was selected to ensure that the power of statistical tests used in the study is of sufficient power to draw valid conclusions. It is expected that given the sensitive nature of the subject, there will be large numbers of selected participants who will decide not to participate, will drop out, or whose parents will not sign the consent form. All participants selected will be taken from the middle school and high school age teens, so aged from 12 through to 17 years old. Half of the sample, so around 400 participants, will be selected through simplified random sampling from school registers of the appropriate years from schools in the district. To ensure that an adequate number of the targeted groups of interest are selected, the other 400 participants will be selected by stratified random sampling. This will involve selecting 100 participants according to each of the following...
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