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AJPH First Look, published online ahead of print May 2, 2006
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Prevalence of HIV Infection Among Young Adults in the United States: Results From the Add Health Study

Martina Morris, PhD, Mark S. Handcock, PhD, William C. Miller, MD, PhD, Carol A. Ford, MD, John L. Schmitz, PhD, Marcia M. Hobbs, PhD, Myron S. Cohen, MD, Kathleen M. Harris, PhD and J. Richard Udry, PhD

Martina Morris and Mark S. Handcock are with the Departments of Sociology and Statistics, University of Washington, Seattle. William C. Miller and Myron S. Cohen are with the Schools of Medicine and Public Health, University of North Carolina, Chapel Hill. Carol A. Ford, John L. Schmitz, and Marcia M. Hobbs are with the School of Medicine, University of North Carolina, Chapel Hill. Kathleen M. Harris is with the Sociology Department, University of North Carolina, Chapel Hill. J. Richard Udry is with the Sociology Department and the School of Public Health, University of North Carolina, Chapel Hill.


Figure 1
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  		FIGURE 1— Add Health wave I and wave II cumulative sexual exposure index differentials, by response status in wave III.

Note. Shown are means and 95% confidence intervals (CIs) for the wave I and wave II cumulative sexual exposure indexes for 3 groups of Add Health survey participants: those who provided a usable specimen in wave III, those who participated in earlier waves but refused either the interview or the HIV test in wave III, and those who participated in earlier waves but either were not interviewed for other reasons in wave III or provided an unusable specimen. Number of sexual partners (both male and female) was multiplied by a prevalence differential factor for location (1 = rural, 2 = semiurban, 5 = urban) to estimate sexual exposure (see "Results" for details).

 




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