Elizabeth Costenbader

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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)
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)
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)
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)
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)
OBJECTIVE To evaluate whether initiation of a contraceptive implant, a method of long-acting reversible contraception, reduces condom use, as measured by a biomarker of recent semen exposure [prostate-specific antigen (PSA)]. STUDY DESIGN We conducted a randomized controlled clinical trial in which 414 Jamaican women at high risk for sexually transmitted(More)
Corrigendum to “The stability of centrality measures when networks are sampled” [Social Networks 25 (2003) 283–307] Elizabeth Costenbadera,∗, Thomas W. Valenteb,1 a Department of Population and Family Health Sciences, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St., Baltimore, MD 21205, USA b Department of Preventive Medicine, University(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)
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)