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enough to enable us to analyze the relationship of condom use to characteristics that are relatively rare in the population, such as drug use. Our objectives are to use the NHSDA data to describe the frequency of condom use among U.S. adults, to determine how this varies by type of sex partner and by the characteristics of respondents (including their engagement in HIV risk behaviors), and to evaluate progress toward achieving specific goals for levels of condom use. In defining HIV risk categories of interest, we have relied on the relatively few exposure categories that account for the source of nearly all recently reported adult and adolescent AIDS cases and HIV infections. Roughly one-half of these reports are from men who have had sex with men, one-third are from injecting drug users and one-sixth have resulted from other sexual behavior.4 We defined individuals at increased risk of HIV through sexual behavior as men who, in the past year, have had sex with other men; men and women who have had six or more partners (because of the association of large numbers of partners John E. Anderson is sociologist, Lynda Doll is chief, Behavioral Intelligence Research Branch, and T. Stephen Jones is assistant director for science, all at the Division of HIV/AIDS Prevention Intervention, Research and Support, National Center for HIV, STD and TB Prevention, Centers for Disease Control and Prevention (CDC), Atlanta. Ronald Wilson was formerly with the National Center for Health Statistics, CDC, Hyattsville, MD. Peggy Barker is survey statistician at the Office of Applied Studies in the Substance Abuse and Mental Health Services Administration, Rockville, MD. Condom Use and HIV Risk Behaviors Among U.S. Adults: Data from a National Survey