The Youth Risk Behavior Survey (YRBS) was administered in a stratified random sample to South Dakota public schools including Bureau of Indian Affairs schools; private schools were not included. The six priority health-risk behaviors assessed in the YRBS are: (1) intentional and unintentional injuries; (2) tobacco use; (3) alcohol and other drug use; (4) sexual behaviors that result in HIV infection, other sexually transmitted diseases, and unintended pregnancy; (5) dietary behaviors; and (6) physical activity. A description of sampling strategy, description of sample, weighting of responses, and rationale for each question are provided. Results are presented for each of the six health risk behaviors along with the related national health objectives for the year 2000. Results are summarized for years 1991, 1993, 1994, and 1997. In addition to presenting the overall results for each question, a separate breakdown is provided for each grade level. Data is provided in graphs showing percentage of responses to each question by year and by grade. (Contains 41 references.) (EMK)