In most cases, the entire student body was targeted for administration of the survey. Some schools conducted an assembly where surveys were administered, while others had students complete the survey in every health or English class throughout the day. In each case, the school was visited on a single day by a number of research staff who explained the study, distributed the surveys, answered questions, and collected the surveys. Students were told that participation was voluntary and that they could refuse to complete the survey if they wished, and were also reminded to keep surveys anonymous by not writing their name or other identifying information anywhere on the survey. Students were given a pen for participating. If a student was not eligible to participate because a parent had denied permission, this student worked quietly on other schoolwork while the other students completed the survey. Data were double-entered from the paper surveys into an electronic database. Data cleaning procedures were performed to ensure that data were not out of range. In addition, random spot checks of the completed surveys were performed to ensure the accuracy of data entry.
