Recent status scores for version 6 of the Addiction Severity Index (ASI-6)
Article first published online: 5 AUG 2011
© 2011 The Authors, Addiction © 2011 Society for the Study of Addiction
Volume 106, Issue 9, pages 1588–1602, September 2011
How to Cite
Cacciola, J. S., Alterman, A. I., Habing, B. and McLellan, A. T. (2011), Recent status scores for version 6 of the Addiction Severity Index (ASI-6). Addiction, 106: 1588–1602. doi: 10.1111/j.1360-0443.2011.03482.x
- Issue published online: 5 AUG 2011
- Article first published online: 5 AUG 2011
- Accepted manuscript online: 6 MAY 2011 04:39AM EST
- Submitted 1 October 2010; initial review completed 3 January 2011; final version accepted 18 April 2011
- Addiction Severity Index;
Aims To describe the derivation of recent status scores (RSSs) for version 6 of the Addiction Severity Index (ASI-6).
Design 118 ASI-6 recent status items were subjected to nonparametric item response theory (NIRT) analyses followed by confirmatory factor analysis (CFA). Generalizability and concurrent validity of the derived scores were determined.
Setting and participants A total of 607 recent admissions to variety of substance abuse treatment programs constituted the derivation sample; a subset (n = 252) comprised the validity sample.
Measurements The ASI-6 interview and a validity battery of primarily self-report questionnaires that included at least one measure corresponding to each of the seven ASI domains were administered.
Findings Nine summary scales describing recent status that achieved or approached both high scalability and reliability were derived; one scale for each of six areas (medical, employment/finances, alcohol, drug, legal, psychiatric) and three scales for the family/social area. Intercorrelations among the RSSs also supported the multi-dimensionality of the ASI-6. Concurrent validity analyses yielded strong evidence supporting the validity of six of the RSSs (medical, alcohol, drug, employment, family/social problems, psychiatric). Evidence was weaker for the legal, family/social support and child problems RSSs. Generalizability analyses of the scales to males versus females and whites versus blacks supported the comparability of the findings, with slight exceptions.
Conclusions The psychometric analyses to derive Addiction Severity Index version 6 recent status scores support the multi-dimensionality of the Addiction Severity Index version 6 (i.e. the relative independence of different life functioning areas), consistent with research on earlier editions of the instrument. In general, the Addiction Severity Index version 6 scales demonstrate acceptable scalability, reliability and concurrent validity. While questions remain about the generalizability of some scales to population subgroups, the overall findings coupled with updated and more extensive content in the Addiction Severity Index version 6 support its use in clinical practice and research.