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The ability to measure centrality in social networks has been a particularly useful development in social network analysis. For researchers trying to decide which centrality measure is most meaningful and valid for their research purposes, various papers have explored the conceptual foundations of centrality measures. Less well documented is the empirical(More)
OBJECTIVE This study examined the association between event-level methamphetamine use and heterosexual risk behaviors. METHOD Data on 1213 heterosexual encounters were collected using audio-computer assisted self interviews from 703 injecting drug users in North Carolina. Data were obtained by asking participants a series of questions about the last time(More)
Many Demographic and Health Surveys (DHS) in the past decade have queried husbands and wives about their current contraceptive use. In this study, couples' concurrence on use and method used is compared by means of data from 23 countries, mostly in sub-Saharan Africa. Husbands report higher levels of use than do their wives in every country studied, with(More)
CONTEXT While literature exists on sexual risks for HIV among rural populations, the specific role of stimulants in increasing these risks has primarily been studied in the context of a single drug and/or racial group. PURPOSE This study explores the use of multiple stimulants and sexual risk behaviors among individuals of different races and sexual(More)
BACKGROUND Heavy alcohol use, hepatitis C and illicit drug use each have been shown to have negative impacts on health-related quality of life (HRQL). To date, considerations of HRQL have not played a prominent role in the design and measurement of intervention strategies for out-of-treatment at-risk populations. METHODS Data were collected from(More)
OBJECTIVES We compared the effects of 2 interventions on alcohol use, use of a new syringe at last injection, and condom use at last sexual encounter in a community sample of injection drug users. METHODS Between 2003 and 2006, 851 out-of-treatment injection drug users were recruited in Raleigh, NC, and Durham, NC, through street outreach and were(More)
AIMS While studies of the social networks of injection drug users (IDUs) have provided insight into how the structures of interpersonal relationships among IDUs affect HIV risk behaviors, the majority of these studies have been cross-sectional. The present study examined the dynamics of IDUs' social networks and HIV risk behaviors over time. DESIGN Using(More)
BACKGROUND Social network factors have been reported to be associated with non-fatal overdose. Yet, few studies have examined how changes in social network characteristics may influence overdose risk. The purpose of this study was to examine the relationship between changes in social network and non-fatal overdose. METHODS Data for this study came from(More)
Gay and bisexual men are often treated as a homogenous group; however, there may be important differences between them. In addition, behaviorally bisexual men are a potential source of HIV infection for heterosexual women. In this study, we compared 97 men who have sex with men only (MSM) to 175 men who have sex with men and women (MSMW). We also compared(More)