Demographic, risk, and spatial factors associated with over-the-counter syringe purchase among injection drug users

Thomas J. Stopka, Alexandra Lutnick, Lynn D. Wenger, Kathryn DeRiemer, Estella M. Geraghty, Alex H. Kral

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Since 2005, California law allowed over-the-counter (OTC) syringe sales pending local authorization. Although pharmacy sales of OTC syringes are associated with reduced injection-mediated risks and decreases in human immunodeficiency virus infection rates, little is known about the factors associated with syringe purchase among injection drug users (IDUs). Using a cross-sectional design, the authors applied targeted sampling to collect quantitative survey data from IDUs (n = 563) recruited in San Francisco, California, during 2008. They also compiled a comprehensive list of retail pharmacies, their location, and whether they sell OTC syringes. They used a novel combination of geographic information system and statistical analyses to determine the demographic, behavioral, and spatial factors associated with OTC syringe purchase by IDUs. In multivariate analyses, age, race, injection frequency, the type of drug injected, and the source of syringe supply were independently associated with OTC syringe purchases. Notably, the prevalence of OTC syringe purchase was 53% lower among African-American IDUs (adjusted prevalence ratio = 0.47, 95% confidence interval: 0.33, 0.67) and higher among injectors of methamphetamine (adjusted prevalence ratio = 1.35, 95% confidence interval: 1.07, 1.70). Two neighborhoods with high densities of IDUs had limited access to OTC syringes. Increased access to OTC syringes would potentially prevent blood-borne infectious diseases among IDUs.

Original languageEnglish (US)
Pages (from-to)14-23
Number of pages10
JournalAmerican Journal of Epidemiology
Volume176
Issue number1
DOIs
StatePublished - Jul 1 2012

Fingerprint

Syringes
Drug Users
Demography
Injections
Confidence Intervals
Geographic Information Systems
San Francisco
Methamphetamine
Pharmacies
Virus Diseases
African Americans
Communicable Diseases
Multivariate Analysis
HIV

Keywords

  • Geographic information system
  • HIV
  • Pharmacies
  • Substance abuse, intravenous
  • Syringes

ASJC Scopus subject areas

  • Epidemiology

Cite this

Demographic, risk, and spatial factors associated with over-the-counter syringe purchase among injection drug users. / Stopka, Thomas J.; Lutnick, Alexandra; Wenger, Lynn D.; DeRiemer, Kathryn; Geraghty, Estella M.; Kral, Alex H.

In: American Journal of Epidemiology, Vol. 176, No. 1, 01.07.2012, p. 14-23.

Research output: Contribution to journalArticle

Stopka, Thomas J. ; Lutnick, Alexandra ; Wenger, Lynn D. ; DeRiemer, Kathryn ; Geraghty, Estella M. ; Kral, Alex H. / Demographic, risk, and spatial factors associated with over-the-counter syringe purchase among injection drug users. In: American Journal of Epidemiology. 2012 ; Vol. 176, No. 1. pp. 14-23.
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