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BACKGROUND Children are commonly exposed at background levels to several ubiquitous environmental pollutants, such as lead and persistent organic pollutants, that have been linked to neurologic and endocrine effects. These effects have prompted concern about alterations in human reproductive development. Few studies have examined the effects of these(More)
PURPOSE For decades, researchers have proclaimed the positive psychosocial benefits of participation in physical activity. However, recent meta-analyses of the literature have found infrequent and inconclusive empirical support for the link between physical activity and psychosocial well-being. In this study, we use data from a longitudinal study to explore(More)
The possibility that homicides can spread from one geographic area to another has been entertained for some time by social scientists, yet systematic efforts to demonstrate the existence, or estimate the strength, of such a diffusion process are just beginning. This paper uses exploratory spatial data analysis (ESDA) to examine the distribution of homicides(More)
To investigate the characteristics of PCBs that are linked to cognitive functioning, those congeners that were concurrently found in 271 Mohawk adolescents were grouped according to structure (dioxin-like or non-dioxin-like) and persistence (persistent or low-persistent). After the effects of the congener groups were orthogonalized, regression analyses(More)
We thank Richard Alba and Dana Haynie for comments on a previous draft. provided technical and administrative support through grants from NICHD (P30 HD32041) and NSF (SBR-9512290). Abstract Model selection strategies play an important, if not explicit, role in quantitative research. The inferential properties of these strategies are largely unknown, so(More)
BACKGROUND Studies of adolescent smoking suggest that the causes of smoking initiation may differ for Blacks and Whites. METHODS Correlates of smoking initiation were examined among 1,277 nonsmokers, ages 12-14, who completed questionnaires in their homes. The analyses examined relationships between smoking initiation and 11 explanatory variables using(More)
The purpose of the study, conducted in Pennsylvania, USA, was to assess the prospective effect of parental encouragement of physical activity (PA) for weight loss on adolescent girls' concern about weight, Body Mass Index (BMI) and objectively-measured PA. Non-Hispanic White girls (N = 177) and their parents were assessed when girls were 9, 11, 13 and 15(More)
In theory, residential mobility is a response to environmental stress only if households do not reduce dissatisfaction through other alternatives, such as housing improvements or repairs. Despite the attention given to stress-reducing alternatives, however, no attempt has been made to test empirically the residential satisfaction model with adjustments.(More)
We describe the compilation of a spatially explicit dataset detailing infant mortality rates in over 10,000 national and subnational units worldwide, benchmarked to the year 2000. Although their resolution is highly variable, subnational data are available for countries representing over 90% of non-OECD population. Concentration of global infant deaths is(More)