Article original De ´terminants psychosociaux d’utilisateurs de drogues d’utiliser une seringue neuve Psychosocial determinants of drug users to use a new syringe M.-C. Bertard a,b , C. Gagne ´ a, * ,b , S.-A. Mercure a,b , M. Gagnon c , G. Godin a,b,d , F. Co ˆte ´ a,b a Bureau 3453, faculte ´ des sciences infirmie `res, pavillon Ferdinand-Vandry, universite ´ Laval, 1050, rue de la Me ´decine, Que ´bec G1V 0A6, Canada b Programme interfacultaire en sante ´ communautaire, pavillon de l’Est, universite ´ Laval, Que ´bec G1V 0A6, Canada c Point de Repe `res, 530, rue Saint-Joseph Est, Que ´bec G1K 3B8, Canada d Chaire de recherche du Canada sur les comportements et la sante ´, pavillon Ferdinand-Vandry, universite ´ Laval, Que ´bec G1V 0A6, Canada Rec ¸u le 12 septembre 2008 ; accepte ´ le 5 janvier 2010 Abstract Background. – A limited number of injection drug users are hard to reach through needle-exchange programs. They obtain their injection material from drug-using peers. This dependence on others can make them more at risk of contracting HIV through sharing non-sterile syringes. The aim of this study is to identify determinants of the intention to systematically resort to use of a new syringe by injection drug users rarely or never involved in needle-exchange programs in Quebec. Methods. – A cross-sectional survey was conducted in Que ´bec city by means of a questionnaire measuring variables from the theory of planned behavior and past behavior. Participants (n = 97) were recruited by acquaintances who kept regular contacts with the local needle-exchange programs. Multiple linear regression was used to identify the psychosocial determinants of the intention, and beliefs underlying those determinants were identified using multiple logistic regression. Results. – Half of participants reported using a new syringe for each injection in the last month. In multivariate analyses, this past behavior together with theory of planned behavior constructs explained 70% of the variation in participants intent to use a new syringe for each injection (control beliefs: b = 0.39; past behavior: b = 0.27; attitude: b = 0.21; perceived behavioral control: b = 0.20; subjective norm: b = 0.12). In logistic regression, six important beliefs were identified. Conclusion. – This study resulted in the development of a predictive model of intention to use always a new syringe for each injection among a population of injection drug users in Quebec. Study results could serve as the foundation for the development of interventions to promote this behavior. # 2010 Elsevier Masson SAS. All rights reserved. Keywords: Syringes; HIV; Behavior; Models; Theoretical; Needle-exchange programs Re ´sume ´ Position du proble `me. – Un certain nombre de personnes utilisant des drogues injectables sont peu atteintes par les programmes d’e ´change de seringues. Ces dernie `res se procurent leur mate ´riel d’injection par l’interme ´diaire de pairs consommateurs. Cette de ´pendance a ` l’e ´gard d’autrui peut les rendre plus a ` risque de contracter le VIH en raison de l’emprunt de seringues non ste ´riles. Le but de cette e ´tude est d’identifier les de ´terminants de l’intention d’utiliser syste ´matiquement des seringues neuves chez des personnes fre ´quentant peu ou pas un programme d’e ´change de seringues que ´be ´cois. Me ´thode. – Quatre-vingt-dix-sept personnes ont re ´pondu a ` un questionnaire mesurant les variables de la the ´orie du comportement planifie ´ (TCP) et le comportement passe ´. La re ´gression line ´aire multiple a e ´te ´ utilise ´e pour identifier les variables pre ´dictives de l’intention ; la re ´gression logistique a permis d’identifier les de ´terminants indirects sous-jacents. Re ´sultats. – La moitie ´ des re ´pondants ont utilise ´ une seringue neuve pour chaque injection au cours du mois pre ´ce ´dent. Le comportement passe ´ et les de ´terminants the ´oriques expliquent 70 % de la variance de l’intention (importance des croyances de contro ˆle : b = 0,39 ; comportement Revue d’E ´ pide ´miologie et de Sante ´ Publique 58 (2010) 197–205 * Auteur correspondant. Adresse e-mail : Camille.Gagne@fsi.ulaval.ca (C. Gagne ´). 0398-7620/$ – see front matter # 2010 Elsevier Masson SAS. Tous droits re ´serve ´s. doi:10.1016/j.respe.2010.01.005