This report contains data from the 1991 Youth Risk Behavior Survey, administered to 1,440 high school students throughout Wisconsin. Included are data on the prevalence of injuries; drug use; sexual behaviors; dietary behaviors; and physical activity. The results revealed that over 80% of students rarely or never wear bicycle helmets and 50% inconsistently wear seatbelts; over 20% of students drank five or more drinks of alcohol within a couple of hours, on two or more days in the past month; 20% of students smoked cigarettes on at least 10 of the last 30 days; over 20% of students and 37% of male students carried a weapon during the past month; 30% of students considered attempting suicide during the past year; nearly 50% of all students were involved in a physical fight during the past year; nearly 50% of all seniors had had sexual intercourse at or before age 16 and 45% of sexually active students did not use a condom during their last sexual intercourse; one in six sexually active students used no birth control method during their last sexual intercourse; and 48% of female students and 25% of male students considered themselves overweight. Results of a human immonudeficiency virus/Acquired Immune Deficiency Syndrome (HIV/AIDS) prevention education survey also are reported which showed that 70% of Wisconsin public schools provided HIV prevention education and health education in grades seven and eight. Contains 33 references. (NB)