(MtF), has asked high school seniors (12th graders) more than a thousand questions every year since 1976 and queried 8th and 10th graders since 1991. The Youth Risk Behavior Surveillance System (YRBSS, administered by the Centers for Disease Control and Prevention) has surveyed high school students since 1991. The American Freshman (AF) Survey, administered by the Higher Education Research Institute, has questioned students entering four-year colleges and universities since 1966. Finally, the General Social Survey (GSS) has examined adults 18 and over since 1972. (For more details on these
  
  ...more




