This report presents results of the 1991 Wyoming Youth Risk Behavior Survey (YRBS) and the 1991 Wyoming School Health Education Survey (SHES). Thirty-five schools participated in the YRBS, with 3,513 students in grades 9-12; 92 public schools with students in grades 7-12 participated in the SHES. Statistical data from the YRBS are provided in the following areas: (1) intentional and unintentional injuries (seat belt use, motorcycle and bicycle safety, motor vehicle safety, carrying of weapons, physical fighting, and suicide); (2) tobacco, alcohol, and other drug use; (3) sexual behaviors that result in Human Immunodeficiency Virus (HIV) infection, other sexually transmitted diseases, and unintended pregnancy; (4) dietary excesses and imbalances; and (5) physical inactivity. SHES data are provided on the topics of provision of HIV prevention education, training received by staff members that provide HIV prevention education, percentage of schools teaching HIV functional knowledge topics and skills by specific grade level, and barriers to implementing effective comprehensive health education and HIV prevention. The report concludes that Wyoming youth engage in behaviors that put them at risk for significant mortality, morbidity, disability, and social problems extending from youth to adulthood, and that effective school-based health education programs are needed to replace these behaviors with healthy behaviors. (Contains 43 references.) (JDD)