Study
Spoth and colleagues (2013) evaluated the PROmoting School-Community-University Partnerships to Enhance Resilience (PROSPER) model in 28 communities in Iowa and Pennsylvania. Communities were paired and matched on school size and demographic location. Eligible schools included those with an enrollment of between 1,300 and 5,200 students. The communities were assigned to either the intervention group or a treatment-as-usual comparison condition. Of the 28 communities that participated, 14 were assigned to the control group and 14 to the intervention group. The intervention group was offered evidence-based interventions (EBIs) through the PROSPER model; the control group received no assistance or project support for prevention programming but were free to implement prevention programming that was normally provided in their school districts. The final sample of participating communities included two cohorts of sixth graders; 85 percent identified as white, 51 percent were female, and 31 percent received reduced-cost lunch.
The 14 intervention communities used the PROSPER partnership model to deliver a family-focused intervention in the sixth grade and a school-based intervention in the seventh grade. Each PROSPER site had a community team of 8 to 12 individuals. These teams selected EBIs from a menu of choices developed by project scientists. For the family-focused intervention, all 14 community teams chose the Strengthening Families Program: For Parents and Youth 10–14 (SFP: 10–14). The intervention group was split into two successive grade cohorts (Cohort 1 and Cohort 2). In year 1, SFP 10–14 was offered to the families of Cohort 1 (sixth graders). During year 2, SFP 10–14 was offered to the families of Cohort 2 (sixth graders). SFP 10–14 consists of seven, 2-hour sessions for parents and youths conducted weekly. The program aims to reduce substance misuse and behavior problems during adolescence through improved skills in nurturing and child management by parents, and by improving interpersonal and personal competencies among youths.
For the school-based intervention, community teams again chose one from among three school-based EBIs to implement in the seventh grade. The first, All Stars, is a 13-session intervention addressing students’ perceptions of substance use and violence, and their abilities to make personal commitments to avoid negative behaviors. The second, Life Skills Training, is a 15-session intervention that develops peer-resistance skills and strategies for avoiding problem behaviors like substance misuse. The third, Project Alert, focuses on social influences across 11 sessions. Life Skills Training and Project Alert were each selected by four teams; the All Stars curriculum was selected by the other six. The school-based program also was implemented with Cohort 2 (seventh graders) the following year.
Data from students was collected via written questionnaires. Pretest assessments were conducted during the fall semester of sixth grade, in 2002, for the 28 communities. Posttest measures were conducted at the end of the seventh grade, following the implementation of the school-based intervention. The follow-up period occurred yearly until students reached 12th grade. The CrimeSolutions review of this study focused on the differences between the intervention and control groups at the 12th grade follow up. The primary outcome of interest was substance misuse. Substances included alcohol, cigarettes, methamphetamine, ecstasy, marijuana, and inhalants; and the illegal use of prescription drugs, including Vicodin, Percocet, and OxyContin. Other outcomes of interest included the frequency of drunkenness and marijuana use, as well as driving after drinking. A longitudinal, multilevel model was applied to measure substance misuse outcomes and growth trajectories. No subgroup analyses were conducted.
Study
Osgood and colleagues (2013) conducted a social-network analysis to study students’ connections with antisocial peers in their peer networks and influences, using the same sample (28 school districts in Iowa and Pennsylvania) as in Study 1 (Spoth et al. 2013). The goal of the study was to test whether the prevention programs could change students’ friendship networks in ways that reduce the potential for negative peer influence toward problem behavior (specifically substance use and delinquency).
The study analyzed the following three separate measures of antisocial behavior and attitudes: substance use, attitudes toward substance use, and delinquent behavior. Substance use was measured by participants’ responses to questions about smoking cigarettes, drinking alcohol, getting drunk, and using marijuana in the past month. Attitudes toward substance use were measured through participants’ responses to 22 questions, ranging from expectations of substance use to refusal to use substances. Finally, delinquent behavior was measured through a 12-item, self-report index of delinquent behavior. These measures were combined into a single composite variable labeled antisocial behavior.
The social-network analysis that was used measures the centrality of an individual’s network position. The concept of centrality relates to each person’s prominence or importance in the network, based on direct and indirect connections to others. Six types of centrality were used to define composite measures: degree centrality, closeness centrality, reach centrality, betweenness centrality, information centrality, and composite centrality. Students in the intervention and control groups were matched for comparison, based on peer social networks. Students were asked to name up to two of their best friends and five additional close friends in their current grade and school. Over 80 percent of the friends named were matched successfully to the class roster. The outcome variable of interest was the interaction between each person in the network’s centrality and their level of antisocial behavior, that is, how antisocial were the peers most central in the networks of each PROSPER youth. No subgroup analyses were conducted.
Study
Spoth and colleagues (2015) evaluated the effect of PROSPER on adolescent conduct problems from 1 to 5 years after primary intervention components were delivered (or 1.5 to 6.5 years after the baseline assessment), using the same sample (28 school districts in Iowa and Pennsylvania) as in Study 1 and 2 (Spoth et al. 2013; Osgood et al. 2013).
Conduct problem behaviors were assessed using items from the National Youth Survey, specifically those items looking at the frequency with which the respondent reported engaging in each of 12 behaviors during the past year. The behaviors included both covert and overt types of conduct problem behaviors. There were four items about stealing or not paying for something; two items about truancy (including running away from home, and skipping school or classes without an excuse); two items measuring aggression directed at other people (such as beating up or causing someone injury); two items measuring destructive behavior directed toward damaging property; and two items concerning representative and potentially serious conduct problems in general adolescent populations.
Adolescents received 1 point for each behavior they reported, yielding potential scores of 0 to 12. Differences between the intervention and control groups were tested using the zero-inflated Poisson (ZIP) model, which is an appropriate statistical analysis to use when there is an instance of a large number of zeroes in the measure of conduct problems. No subgroup analyses were conducted.