title: A capture-recapture technique to estimate the size of the injecting drug user population attending syringe exchange programs: AjUDE-Brasil II Project.
abstract: This paper presents the results of a study with a two-occasion capture-recapture design. The data are part of the AjUDE-Brasil II Project, carried out in 2000-2001. Estimation of the size of the IDU population attending a syringe-exchange program (SEP) in São José do Rio Preto, Salvador, and Porto Alegre, Brazil, was performed using Chao's model. Capture probabilities were also estimated. For Porto Alegre a comparison of the results from the AjUDE-Brasil I and AjUDE-Brasil II Projects was performed. Results are also presented for error rates secondary to the choice of matching criteria.
authors.affiliation: Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. sueli@est.ufmg.br
authors.forename: Sueli Aparecida
authors.initials: SA
authors.lastname: Mingoti
authors.forename: Waleska Teixeira
authors.initials: WT
authors.lastname: Caiaffa
mesh_terms: D001938:Brazil / Q000453:epidemiology; D003627:Data Interpretation, Statistical; D006801:Humans; D015233:Models, Statistical; D009313:National Health Programs / Q000706:statistics & numerical data*; D018671:Needle-Exchange Programs / Q000706:statistics & numerical data*; D011159:Population Surveillance; D015819:Substance Abuse, Intravenous / Q000453:epidemiology*