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 of alcohol or drug use. Urban African American girls were more likely to be in this class (0.21) than were urban or rural European American girls (0.04 and 0.05, respectively). We labeled this class “adolescent dual problem” reflecting the association with mid-adolescent initiation of sexual activity and tobacco use, but no early alcohol/drug use. Girls from the high-risk sample had an elevated probability of membership in this class (0.65). Girls in risk class 3 (27 % of the sample) showed an elevated probability of very early tobacco use (0.89), and very early alcohol-drug use (0.57) but were unlikely to initiate very early or early sexual activity (0.00– 0.34, respectively). Urban European American girls were more likely to be in this class (0.44) than either urban African American (0.19) or rural European American girls (0.32). We labeled this class “preadolescent substance users” because they initiated both tobacco and alcohol/drug use in preadolescence, but did not initiate concurrent sexual activity. Girls in
