Sixth version of the Addiction Severity Index: Assessing sensitivity to therapeutic change and retention predictors1

The main purpose of this multicenter ex post facto prospective study is to examine the psychometric properties of the Addiction Severity Index version 6.0 (ASI-6) in Spanish outpatients and determine the predictor variables of treatment adherence. A total of 186 outpatients with a substance dependence diagnosis (mean age 40 years; 80% male) were assessed with the ASI-6 and Clinical Global Impression 1 This research was supported by the Spanish Plan Nacional Sobre Drogas. The authors want to thank the institutional support and the professional participation of eight centers: UTCA, SERGAS, Orense, C. Asturias, Gijón, H. Ramón y Cajal, Madrid, H. Sant Pau, Barcelona, UAD, Carballo (La Coruña), CAD San Juan de Dios, Palencia, CSM Retiro, Madrid, and CSM Teatinos, Oviedo. Finally, we would especially like to thank the TRC (Treatment Research Center) and TRI (Treatment Research Institute) at the University of Pennsylvania. 2 Correspondence: Facultad de Psicología. Universidad de Oviedo. Plaza Feijoo, s/n. 33033 Oviedo (Spain). E-mail: [email protected] © International Journal of Clinical and Health Psychology ISSN 1697-2600 print ISSN 2174-0852 online 2011, Vol. 11, No 3, pp. 495-508