Within the adolescent risk behavior literature, questions remain about relationships among behaviors in early adolescence, gender, context, and negative social and health outcomes. Additionally, little attention has focused on trajectories of adolescent risk behavior among impoverished African American youth. Using data from the Mobile Youth Survey, a multiple cohort longitudinal study of adolescents living in impoverished neighborhoods, we have reduced gaps in the literature by identifying trajectories of alcohol use for males and females separately as a function of early initiation of alcohol use. Our findings indicate that early initiation of alcohol use predicts escalating use at least through age 17. Results are especially notable for females who begin drinking before age 12: They drink significantly more than any other group at age 12 and their trajectory remains the highest through age 17. Our findings about the escalation of drinking have implications for efforts to improve the lives of impoverished adolescents.

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Although sleep problems are associated with negative outcomes among adolescents, studies have not focused on sleep disorder symptoms among adolescents living in impoverished neighborhoods and how sleep problems may be related to two factors common in those environments: hopelessness and exposure to violence. This study used data from the longitudinal Mobile Youth Survey (MYS; N = 11,838, 49% female, 93% African-American) to examine trajectories of sleep problems by age (10-18 years) among impoverished adolescents as a function of gender, feelings of hopelessness, and exposure to violence. The results indicate that sleep problems associated with traumatic stress decline with age, with four notable distinctions. First, the steepest decline occurs during the early adolescent years. Second, the rate of decline is steeper for males than for females. Third, exposure to violence impedes the rate of decline for all adolescents, but more dramatically for females than for males. Fourth, the rate of decline is smallest for adolescents with feelings of hopelessness who also had been exposed to violence. To explore the generalizability of these results to other types of sleep disorders, we analyzed cross-sectional data collected from a subsample of 14- and 15-year-old MYS participants (N = 263, 49% female, 100% African-American) who completed a sleep symptoms questionnaire. Four results from the cross-sectional analysis extend the findings of the longitudinal analysis. First, the cross-sectional results showed that symptoms of apnea, insomnia, nightmares, and restless legs syndrome or periodic limb movement disorder (RLS/PLMD), as well as daytime sleepiness, increase as a function of hopelessness. Second, symptoms of insomnia, RLS, and nightmares, as well as daytime sleepiness, increase as function of exposure to violence. Third, symptoms of insomnia and RLS/PLMD are greater under conditions of combined hopelessness and exposure to violence than for either condition alone. Fourth, symptoms of RLS/PLMD are worst for females who have been exposed to violence and experience hopelessness. Overall, the findings suggest that hopelessness and exposure to violence have negative independent and multiplicative effects on adolescent sleep, particularly for females. Understanding the causal factors associated with inadequate sleep in impoverished adolescents is important for three reasons. First, sleep is an important aspect of adolescent development. Second, inadequate sleep has severe consequences for adolescent morbidity, mortality, and overall quality of life. Third, impoverished adolescents are at the most severe risk for poor outcomes, and improvement in their sleep may produce large gains.

While previous research has shown alcohol use to increase developmentally throughout adolescence, the age of alcohol initiation has rarely been incorporated into developmental trajectories. Simultaneous estimation of the effects of early alcohol initiation was made in relation to the recency and frequency of alcohol use utilizing a sample of 1,209 low-income, minority adolescents initiating alcohol between 12 and 18. Significant effects of both age of alcohol initiation and gender were found. Initial alcohol use was higher the later the adolescent initiated alcohol use. Following initiation, trajectories of the recency and frequency of alcohol use for female adolescents increased more rapidly the earlier they initiate alcohol use, while trajectories for male adolescents increased independent of their year