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Background and Objectives: The past 10 years' wave of syphilis epidemics has challenged syphilis control programs. Although apparently connected to drugs-for-sex trading of crack cocaine, the genesis and resolution of these epidemics is poorly understood.Goals Of the Study: The goals of this study were to develop a mathematical model of epidemic syphilis transmission based on empiric data, to stimulate and ascertain behavioral and sociologic features necessary to produce epidemic transmission, and to explore mechanisms leading to resolution of epidemic transmission.Study Design: The study used multi-compartment iterative computer simulation using empirically derived input data.Results: Epidemic transmission resulted from adding a small core group of individuals with very high levels of partner exchange (300-400 partners per year) to a population with levels of partner exchange seen in the general population. Epidemic resolution could result from immunity or subtle changes in the size or partner exchange rate of the core group.Conclusion: There is a need for sexually transmitted disease control programs to reevaluate their approach to prevention and control of epidemic syphilis in light of data on transmission dynamics. [ABSTRACT FROM AUTHOR]

Three important features to examine for measures used to systematically monitor progress over time are (a) technical features of static scores, (b) technical features of slope, and (c) instructional utility. The purpose of this study was to investigate the technical features of slope of four early numeracy curriculum-based measures administered to kindergarten students. Approximately 200 students were assessed at the beginning and end of the school year, and a subset of students (n = 55) was assessed three additional times during the year. Growth curve analysis was used to model growth over time. The contribution of slope to explaining variance on a criterion measure was examined for the curriculum-based measures that fit a linear growth pattern. Implications are discussed regarding monitoring progress in early mathematics. [ABSTRACT FROM AUTHOR]

The developmental model of adolescent antisocial behavior advanced by Patterson and colleagues (e.g., Patterson, Reid, & Dishion, 1992) appears to generalize the development of a diverse set of problem behaviors. Structural equation modeling methods were applied to 18-month longitudinal data from 523 adolescents. The problem behavior construct included substance use, antisocial behavior, academic failure, and risky sexual behavior. Families with high levels of conflict were less likely to have high levels of parent-child involvement. Such family conditions resulted in less adequate parental monitoring of adolescent behavior, making associations with deviant peers more likely. Poor parental monitoring and associations with deviant peers were strong predictors of engagement in problem behavior. These constructs accounted for 46% of the variance in problem behavior. Although association with deviant peers was the most proximal social influence on problem behavior, parental monitoring and family factors (conflict and involvement) were key parenting practices that influenced this developmental process. [ABSTRACT FROM AUTHOR]