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clinics. National surveillance data based on STD clinic data may not provide reliable information about the treatment of STDs, because an estimated 40–60% of STD cases are treated outside of STD clinics.3 Our objectives in this article are to provide population-based estimates of the prevalence of patient-reported STDs and to characterize patterns of treatment utilization according to specific STDs and client characteristics. The analyses use data from the National Health and Social Life Survey (NHSLS), a population-based survey of the sexual behavior of Americans. This survey obtained information directly from respondents about which STDs they had had and where they had received treatment for their STD. A conceptual model of health care–seeking behavior for STDs may help us understand where people go for treatment of an STD, and who goes where.4 For instance, where people choose to go for treatment could be influenced by their previous experience with health care providers, as well as by the perceived efficacy of preRobert M. Brackbill is a behavioral epidemiologist, Maya R. Sternberg is a statistician and Martin Fishbein is a visiting scientist, all with the Division of STD Prevention at the Centers for Disease Control and Prevention, Atlanta, GA. The authors acknowledge Stuart Michaels, the project manager of the National Health and Social Life Survey, for his provision of additional information on sampling weights and design, and Dr. Stuart Berman for his astute comments on the manuscript, which greatly improved the final product. Where Do People Go for Treatment of Sexually Transmitted Diseases?