This youth risk behavior survey was completed by 7,667 students at 127 Bureau of Indian Affairs (BIA) middle schools. The document is organized around the six categories of behavior that contribute substantially to the leading causes of death, illness, and social problems in the United States: unintentional and intentional injuries; tobacco use; alcohol and other drug use; sexual behaviors that contribute to unintended pregnancy and sexually transmitted disease; dietary behaviors; and physical activity. Results indicate that male middle school students were significantly more likely than female students to carry a gun or other weapon; engage in physical fights; use chewing tobacco or snuff; have sexual intercourse with three or more partners; and exercise and play sports. Female middle school students were significantly more likely than male students to consider or attempt suicide; think they are overweight; and diet, vomit, or take laxatives or diet pills to lose or maintain weight. Students in each of grades 6-8 were significantly more likely than students in the preceding grade to ride with a driver who had been drinking alcohol; engage in a physical fight; smoke cigarettes; drink alcohol; use marijuana; and have sexual intercourse with three or more partners. (Contains nine data tables.) (TD)