Using dual capture/recapture studies to estimate the population size of persons who inject drugs (PWID) in the city of Hai Phong, Vietnam

Don Des Jarlais, Pham Minh Khue, Jonathan Feelemyer, Kamyar Arasteh, Duong Thi Huong, Khuat Thi Hai Oanh, Hoang Thi Giang, Nham Thi Tuyet Thanh, Vu Hai Vinh, Douglas D. Heckathorn, Jean Pierre Moles, Roselyne Vallo, Catherine Quillet, Delphine Rapoud, Laurent Michel, Didier Laureillard, Ted Hammett, Nicolas Nagot

Research output: Contribution to journalArticle

Abstract

Background: Good estimates of key population sizes are critical for appropriating resources to prevent HIV infection. We conducted two capture/recapture studies to estimate the number of PWID currently in Hai Phong, Vietnam. Methods: A 2014 respondent-driven sampling (RDS) survey served as one capture, and distribution of cigarette lighters at drug use “hotspots” in 2016 served as another “capture.” A 2016 survey using RDS, conducted 1 week after lighter distribution, served as “recapture” for both captures. Recaptured participants in the two surveys were identified with a computerized fingerprint reader. Recaptured participants from the lighter distribution were asked to show their lighters. Results: 1385 participants were included in the “recapture” survey. They were 94% male and had a median age of 39. All (100%) injected heroin, and HIV prevalence was 30%. 144 of the 603 participants in the 2014 survey and 152 of the 600 PWID who had received lighters were “recaptured” in the 2016 survey. After adjusting for police suppression of drug use hotspots and conducting sensitivity analyses, our best estimate of the population size from the lighter recapture was 4617 (95% CI: 4090–5143), and our best estimate from the 2014 survey recapture was 5220 (95% CI: 4568–5872). A combined best estimate of the PWID population in Hai Phong is 5000, range 4000–6000. Conclusions: The capture/recapture studies produced consistent estimates. Adding a lighter/token distribution to planned RDS surveys may provide an inexpensive method for estimating PWID population size. Analyses of the estimates should include contextual information about the local drug scene.

Original languageEnglish (US)
Pages (from-to)106-111
Number of pages6
JournalDrug and Alcohol Dependence
Volume185
DOIs
StatePublished - Apr 1 2018

Fingerprint

Vietnam
Population Density
Pharmaceutical Preparations
Sampling
Surveys and Questionnaires
Heroin
Law enforcement
Tobacco Products
Dermatoglyphics
Police
HIV Infections
HIV

Keywords

  • Capture/lecapture methods
  • Hai Phong
  • HIV
  • Persons who inject drugs
  • Respondent driven sampling
  • Vietnam

ASJC Scopus subject areas

  • Toxicology
  • Pharmacology
  • Psychiatry and Mental health
  • Pharmacology (medical)

Cite this

Using dual capture/recapture studies to estimate the population size of persons who inject drugs (PWID) in the city of Hai Phong, Vietnam. / Des Jarlais, Don; Khue, Pham Minh; Feelemyer, Jonathan; Arasteh, Kamyar; Thi Huong, Duong; Thi Hai Oanh, Khuat; Thi Giang, Hoang; Thi Tuyet Thanh, Nham; Vinh, Vu Hai; Heckathorn, Douglas D.; Moles, Jean Pierre; Vallo, Roselyne; Quillet, Catherine; Rapoud, Delphine; Michel, Laurent; Laureillard, Didier; Hammett, Ted; Nagot, Nicolas.

In: Drug and Alcohol Dependence, Vol. 185, 01.04.2018, p. 106-111.

Research output: Contribution to journalArticle

Des Jarlais, D, Khue, PM, Feelemyer, J, Arasteh, K, Thi Huong, D, Thi Hai Oanh, K, Thi Giang, H, Thi Tuyet Thanh, N, Vinh, VH, Heckathorn, DD, Moles, JP, Vallo, R, Quillet, C, Rapoud, D, Michel, L, Laureillard, D, Hammett, T & Nagot, N 2018, 'Using dual capture/recapture studies to estimate the population size of persons who inject drugs (PWID) in the city of Hai Phong, Vietnam', Drug and Alcohol Dependence, vol. 185, pp. 106-111. https://doi.org/10.1016/j.drugalcdep.2017.11.033
Des Jarlais, Don ; Khue, Pham Minh ; Feelemyer, Jonathan ; Arasteh, Kamyar ; Thi Huong, Duong ; Thi Hai Oanh, Khuat ; Thi Giang, Hoang ; Thi Tuyet Thanh, Nham ; Vinh, Vu Hai ; Heckathorn, Douglas D. ; Moles, Jean Pierre ; Vallo, Roselyne ; Quillet, Catherine ; Rapoud, Delphine ; Michel, Laurent ; Laureillard, Didier ; Hammett, Ted ; Nagot, Nicolas. / Using dual capture/recapture studies to estimate the population size of persons who inject drugs (PWID) in the city of Hai Phong, Vietnam. In: Drug and Alcohol Dependence. 2018 ; Vol. 185. pp. 106-111.
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abstract = "Background: Good estimates of key population sizes are critical for appropriating resources to prevent HIV infection. We conducted two capture/recapture studies to estimate the number of PWID currently in Hai Phong, Vietnam. Methods: A 2014 respondent-driven sampling (RDS) survey served as one capture, and distribution of cigarette lighters at drug use “hotspots” in 2016 served as another “capture.” A 2016 survey using RDS, conducted 1 week after lighter distribution, served as “recapture” for both captures. Recaptured participants in the two surveys were identified with a computerized fingerprint reader. Recaptured participants from the lighter distribution were asked to show their lighters. Results: 1385 participants were included in the “recapture” survey. They were 94{\%} male and had a median age of 39. All (100{\%}) injected heroin, and HIV prevalence was 30{\%}. 144 of the 603 participants in the 2014 survey and 152 of the 600 PWID who had received lighters were “recaptured” in the 2016 survey. After adjusting for police suppression of drug use hotspots and conducting sensitivity analyses, our best estimate of the population size from the lighter recapture was 4617 (95{\%} CI: 4090–5143), and our best estimate from the 2014 survey recapture was 5220 (95{\%} CI: 4568–5872). A combined best estimate of the PWID population in Hai Phong is 5000, range 4000–6000. Conclusions: The capture/recapture studies produced consistent estimates. Adding a lighter/token distribution to planned RDS surveys may provide an inexpensive method for estimating PWID population size. Analyses of the estimates should include contextual information about the local drug scene.",
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AU - Des Jarlais, Don

AU - Khue, Pham Minh

AU - Feelemyer, Jonathan

AU - Arasteh, Kamyar

AU - Thi Huong, Duong

AU - Thi Hai Oanh, Khuat

AU - Thi Giang, Hoang

AU - Thi Tuyet Thanh, Nham

AU - Vinh, Vu Hai

AU - Heckathorn, Douglas D.

AU - Moles, Jean Pierre

AU - Vallo, Roselyne

AU - Quillet, Catherine

AU - Rapoud, Delphine

AU - Michel, Laurent

AU - Laureillard, Didier

AU - Hammett, Ted

AU - Nagot, Nicolas

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N2 - Background: Good estimates of key population sizes are critical for appropriating resources to prevent HIV infection. We conducted two capture/recapture studies to estimate the number of PWID currently in Hai Phong, Vietnam. Methods: A 2014 respondent-driven sampling (RDS) survey served as one capture, and distribution of cigarette lighters at drug use “hotspots” in 2016 served as another “capture.” A 2016 survey using RDS, conducted 1 week after lighter distribution, served as “recapture” for both captures. Recaptured participants in the two surveys were identified with a computerized fingerprint reader. Recaptured participants from the lighter distribution were asked to show their lighters. Results: 1385 participants were included in the “recapture” survey. They were 94% male and had a median age of 39. All (100%) injected heroin, and HIV prevalence was 30%. 144 of the 603 participants in the 2014 survey and 152 of the 600 PWID who had received lighters were “recaptured” in the 2016 survey. After adjusting for police suppression of drug use hotspots and conducting sensitivity analyses, our best estimate of the population size from the lighter recapture was 4617 (95% CI: 4090–5143), and our best estimate from the 2014 survey recapture was 5220 (95% CI: 4568–5872). A combined best estimate of the PWID population in Hai Phong is 5000, range 4000–6000. Conclusions: The capture/recapture studies produced consistent estimates. Adding a lighter/token distribution to planned RDS surveys may provide an inexpensive method for estimating PWID population size. Analyses of the estimates should include contextual information about the local drug scene.

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