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Douglas D Heckathorn

Publications and source records attributed to Douglas D Heckathorn.

5 recordsLinked to original sources
PubMed2007

Convergence of HIV seroprevalence among injecting and non-injecting drug users in New York City.

OBJECTIVE: To compare HIV prevalence among injecting and non-injecting heroin and cocaine users in New York City. As HIV is efficiently transmitted through the sharing of drug-injecting equipment, HIV infection has historically been higher among injecting drug users. DESIGN: Two separate cross-sectional surveys, both with HIV counseling and testing and drug use and HIV risk behavior questionnaires. METHODS: Injecting and non-injecting heroin and cocaine users recruited at detoxification and methadone maintenance treatment from 2001-2004 (n = 2121) and recruited through respondent-driven sampling from a research storefront in 2004 (n = 448). RESULTS: In both studies, HIV prevalence was nearly identical among current injectors (injected in the last 6 months) and heroin and cocaine users who had never injected: 13% [95% confidence interval (CI), 12-15%] among current injectors and 12% (95% CI, 9-16%) among never-injectors in the drug treatment program study, and 15% (95% CI, 11-19%) among current injectors and 17% (95% CI, 12-21%) among never injectors in the respondent driven sampling storefront study. The 95% CIs overlapped in all gender and race/ethnicity subgroup comparisons of HIV prevalence in both studies. CONCLUSIONS: The very large HIV epidemic among drug users in New York City appears to be entering a new phase, in which sexual transmission is of increasing importance. Additional prevention programs are needed to address this transition.

Adult↗
PubMed2006

Effectiveness of respondent-driven sampling for recruiting drug users in New York City: findings from a pilot study.

A number of sampling methods are available to recruit drug users and collect HIV risk behavior data. Respondent-driven sampling (RDS) is a modified form of chain-referral sampling with a mathematical system for weighting the sample to compensate for its not having been drawn randomly. It is predicated on the recognition that peers are better able than outreach workers and researchers to locate and recruit other members of a "hidden" population. RDS provides a means of evaluating the reliability of the data obtained and also allows inferences about the characteristics of the population from which the sample is drawn. In this paper we present findings from a pilot study conducted to assess the effectiveness of RDS to recruit a large and diversified group of drug users in New York City. Beginning with eight seeds (i.e., initial recruits) we recruited 618 drug users (injecting and non-injecting) in 13 weeks. The data document both cross-gender and cross-race and -ethnic recruitment as well as recruitment across drug-use status. Sample characteristics are similar to the characteristics of the drug users recruited in other studies conducted in New York City. The findings indicate that RDS is an effective sampling method for recruiting diversified drug users to participate in HIV-related behavioral surveys.

Adult↗
PubMed2005

From networks to populations: the development and application of respondent-driven sampling among IDUs and Latino gay men.

One of the challenges in studying HIV-risk behaviors among gay men is gathering information from a non-biased sample, as traditional probability sampling methods cannot be applied in gay populations. Respondent-Driven Sampling (RDS) has been proposed as a reliable and bias-free method to recruit "hidden" populations, such as gay men. The aim of this study is to assess the feasibility and effectiveness of RDS to sample Latino gay men and transgender persons. This was carried out when we used RDS to recruit participants into a study that investigated community involvement on HIV/AIDS sexual risk behaviors among Latino gay and bisexual men, and transgender (male-to-female) persons in Chicago and San Francisco. The population coverage of RDS was then compared to simulated time-location sampling (TLS). Recruitment differences were observed across cities, but the samples were comparable. RDS showed broader population coverage than TLS, especially among individuals at high risk for HIV.

Adult↗
PubMed2002

Increasing drug users' adherence to HIV treatment: results of a peer-driven intervention feasibility study.

Active drug users with HIV infection suffer from both low utilization of, and adherence to, primary care. Combining drug treatment and primary care on-site reduces these problems significantly because it creates a social support structure; treatment program staffs can monitor patients' adherence and provide ongoing encouragement. But in the United States, only a very small minority of HIV + drug users receive this demonstrably effective form of care. We report the results from a feasibility study of an alternative support structure, termed a "peer-driven intervention", that serves as a functional equivalent to drug treatment for increasing drug users' adherence to HIV therapeutics. The six-month study included 14 adult active drug users receiving medical care for HIV disease in New Haven, Connecticut. As a health advocate, each subject was assigned and asked to meet with another subject once a week at the project's storefront to provide peer support and counseling. As a peer, each subject was assigned and asked to meet with another health advocate once a week to receive support in keeping up his or her medical care. No two subjects played both roles for one another. Advocates earned nominal monetary rewards for eliciting positive responses from their peers in keeping clinical appointments, responding to physicians' referrals, picking up prescriptions on time and attending weekly meetings with the advocate. The results of the study suggest that an alternative social support structure to drug treatment is feasible for increasing active drug users' adherence to medical care. Innovative mechanisms that harness drug users' peer pressure to promote positive behavioral changes deserve greater study.

Acquired Immunodeficiency Syndrome↗