Table 4 shows the prevalence of the four risk classes that emerged for girls. Risk class 1 represented about 28 % of the girls in the sample. Girls in this class were likely to be very early sexual initiators (0.54), very early tobacco initiators (0.92), and very early alcohol users (0.89), with an elevated probability of pregnancy (0.55) and STD (0.44). We labeled this class “preadolescent multi-problem”. Relative risk for membership in this class was 0.36 for urban African American girls compared with 0.28 and 0.23 for urban and rural European American girls, respectively, and girls from the high-risk sample were relatively likely to be in this class (0.73). Girls in Class 2 (10 % of the sample) had an elevated probability of initiating early (but not very early) sex (0.93) and very early or early tobacco use (0.57–0.80, respectively) and also showed a very elevated probability of pregnancy (0.72). The probability of experiencing an STD was low (0.26) but higher than the probability experienced by girls in class 3 or 4. Interestingly, this group had an extremely low probability
