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  • Title: [Cohort study methodology of the ITINERE Project on heroin users in three Spanish cities and main characteristics of the participants].
    Author: de la Fuente de Hoz L, Brugal Puig MT, Ballesta Gómez R, Bravo Poetela MJ, Barrio Anta G, Domingo Salvany A, Silva do Rosario T, Ambrós Hortensi M, Grupo del proyecto ITINERE.
    Journal: Rev Esp Salud Publica; 2005; 79(4):475-91. PubMed ID: 16465964.
    Abstract:
    BACKGROUND: Cohort studies make it possible to monitor the health impact of drug use and to identify related factors. We describe the methodology and baseline characteristics of a cohort of heroin users designed with this objective. METHODS: The participants were 991 young, community-recruited heroin users in Barcelona, Madrid and Seville. Most subjects were named by other participants (39.7%) or by non-participating drug users or ex-users (44.7%). A computer-aided questionnaire was administered (self-administered with audio for questions related with sex). A dried-blood spot sample was collected and anthropometric measurements were made. Both participants and recruiters received remuneration. Univariate and bivariate statistical methods were used. RESULTS: Some 42.4% had changed the main route of heroin administration, mainly to injection in Barcelona and to the pulmonary route in Seville. About 75.8% (Barcelona), 49.8% (Madrid), and 15.5% (Seville) had injected drugs in the last 12 months. In Madrid and Seville, 96-97% used heroin in base form, while in Barcelona heroin hydrochloride predominated. Heroin and cocaine were frequently mixed in the same dose (generally base cocaine in Madrid and Seville, and cocaine hydrochloride in Barcelona). CONCLUSIONS: Important geographic differences persist in the prevalence of drug injection and in the patterns of heroin and cocaine use, which could explain the unequal distribution of some health problems. The difficulties encountered in recruiting the sample suggest that the incidence of heroin use has declined considerably.
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