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OBJECTIVES Parks provide places for people to experience nature, engage in physical activity, and relax. We studied how residents in low-income, minority communities use public, urban neighborhood parks and how parks contribute to physical activity. METHODS In 8 public parks, we used direct observation to document the number, gender, race/ethnicity, age(More)
Prior studies have found that partner abuse is related to risky sexual behavior. However, few studies have explored gender, sexual orientation, or substance use differences in this association, especially among people with HIV. We examined data from the Risk and Prevention survey from the HIV Cost and Services Utilization Study (HCSUS) sample on 726(More)
BACKGROUND: New tools are needed to examine physical activity and the contexts in which it occurs. Community parks contribute to physical activity, but measuring activity and associated variables in them is challenging because area contexts change and the numbers and characteristics of users are highly variable. METHODS: We developed SOPARC (System for(More)
We used stochastic modeling and computer simulation to study the replication, apoptosis, and differentiation of murine hemopoietic stem cells (HSCs) in vivo. This approach allows description of the behavior of an unobserved population (ie, HSCs) on the basis of the behavior of observed progeny cells (ie, granulocytes and lymphocytes). The results of(More)
HIV is a serious public health problem for homeless populations. Homeless men who have sex with women have received less attention in the HIV risk literature than other homeless populations. This research uses multi-level modeling to investigate the context of unprotected sex among heterosexually active homeless men in the Skid Row area of Los Angeles.(More)
T he U.S. prison population declined for the third consecutive year, falling to an estimated 1,571,013 prisoners at yearend 2012 (figure 1). This was down 27,770 prisoners (1.7%) from yearend 2011. California had the greatest population decline, with 15,035 fewer prisoners than in 2011 in part due to the state's Public Safety Realignment policy. In 2012,(More)
In this paper, we describe a hidden two-compartment stochastic process used to model the kinetics of feline hematopoietic stem cells (HSCs) in continuous time. Because of the experimental design and data collection scheme, the inferential task presents numerous challenges. While the hematopoietic process evolves in continuous time, the observations are(More)
BACKGROUND Panic disorder is a prevalent, often disabling condition among patients in the primary care setting. Although numerous studies have assessed the effectiveness of treatments for depression in primary care, few such studies have been conducted for panic disorder. OBJECTIVE To implement and test the effectiveness of a combined pharmacotherapy and(More)
CONTEXT Improving the quality of mental health care requires moving clinical interventions from controlled research settings into real-world practice settings. Although such advances have been made for depression, little work has been performed for anxiety disorders. OBJECTIVE To determine whether a flexible treatment-delivery model for multiple primary(More)
CONTEXT Anxiety disorders commonly present in primary care, where evidence-based mental health treatments often are unavailable or suboptimally delivered. OBJECTIVE To compare evidence-based treatment for anxiety disorders with usual care (UC) in primary care for principal and comorbid generalized anxiety disorder (GAD), panic disorder (PD), social(More)