Document Detail

Validity of the Severity of Dependence Scale (SDS) construct applying the item response theory to a non-clinical sample of heroin users.
MedLine Citation:
PMID:  18570025     Owner:  NLM     Status:  MEDLINE    
AIMS: The purpose of this work is to study the validity of the Severity of Dependence Scale (SDS) construct by applying Rasch models to a non-clinical sample of heroin abusers. SUBJECTS: 982 (73% men) young people 30 years old or under (mean age 25.9 years) participated. All of them were captured from the community in the metropolitan areas of Madrid, Barcelona and Seville, between April 2002 and December 2003. ANALYSIS: Dimensionality of the scale and calibration of items were studied using the Rating Scale model, which is a Rasch-type model. A factorial analysis was also performed to check the dimensionality of the scale. RESULTS: The analysis of fit shows that all the items have infit and outfit values between +/- 2 logits, indicating that the data fit the model and that it may be assumed to be unidimensional. The principal components analysis also showed the existence of a principal factor that explains 52.5% of the variance observed. Item calibration found that they are between +0.89 and -1.04 logits on the scale. CONCLUSION: The results show unidimensional structure of the SDS scale. Item calibration shows they are distributed along the continuum, which must be taken into account when calculating total scores. The study's limitations are noted.
Francisco Gonzalez-Saiz; Oscar M Lozano; Rosario Ballesta; Teresa Silva; Maria Teresa Brugal; Izaskun Bilbao; Gregorio Barrio; Antonia Domingo-Salvany; Maria Jose Bravo; Luis De la Fuente; Grupo Del Proyecto Itinere
Related Documents :
20061185 - The minnesota multiphasic personality inventory-2-restructured form in the epilepsy mon...
15488415 - Multigrid priors for a bayesian approach to fmri.
10539985 - Measuring perceived barriers to condom use: psychometric evaluation of the condom barri...
16018485 - Relationships between experienced listener ratings of multichannel audio quality and na...
10765435 - The role of performance assessment in the regulation of underground disposal of radioac...
24182145 - A comparative study of principal component analysis and independent component analysis ...
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Substance use & misuse     Volume:  43     ISSN:  1082-6084     ISO Abbreviation:  Subst Use Misuse     Publication Date:  2008  
Date Detail:
Created Date:  2008-06-23     Completed Date:  2008-08-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9602153     Medline TA:  Subst Use Misuse     Country:  United States    
Other Details:
Languages:  eng     Pagination:  919-35     Citation Subset:  IM    
Fundacion Andaluza para la Atencion a las Drogodependencias, Sevilla, Spain.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Data Collection / statistics & numerical data
Factor Analysis, Statistical
Heroin Dependence / diagnosis*,  epidemiology,  psychology
Models, Statistical
Principal Component Analysis
Psychiatric Status Rating Scales / statistics & numerical data*
Reproducibility of Results
Severity of Illness Index
Spain / epidemiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Civic norms and etiquettes regarding marijuana use in public settings in New York City.
Next Document:  Variation in family structure among urban adolescents and its effects on drug use.