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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).