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However, it seems unlikely that, for example, the older respondents experienced a historical event that altered not only the relation of current age to STI but also the nature of the association between age at first intercourse and STI. Chantala K, Tabor J. We used simple logistic regression to obtain adjusted estimates of the prevalence odds ratios for having an STI at wave 3. The increased STI risk is due, in part, to a biologic predisposition of the immature cervix to infection if exposed 4 — 6 and to the increased likelihood of engaging in riskier sexual behaviors among persons who initiate sexual intercourse at younger ages 3 , 7 — 9.