Validity of the Severity of Dependence Scale (SDS) Construct Applying the Item Response Theory to a Non-Clinical Sample of Heroin Users

Autor:	Gregorio Barrio, Francisco González-Saiz, Antònia Domingo-Salvany, Luis de la Fuente, Rosario Ballesta, Teresa Madeira da Silva, Óscar M. Lozano, Grupo del Proyecto ItÍnere, María J. Bravo, M. T. Brugal, Izaskun Bilbao
Rok vydání:	2008
Předmět:	Adult Male medicine.medical_specialty Health (social science) Psychometrics media_common.quotation_subject Medicine (miscellaneous) Sample (statistics) Severity of Illness Index Item response theory medicine Humans Psychiatry Probability media_common Psychiatric Status Rating Scales Principal Component Analysis Models Statistical Rasch model Heroin Dependence Data Collection Addiction Public Health Environmental and Occupational Health Reproducibility of Results Psychiatry and Mental health Spain Scale (social sciences) Female Factor Analysis Statistical Psychology Construct (philosophy) Psychopathology
Zdroj:	Substance Use & Misuse. 43:919-935
ISSN:	1532-2491 1082-6084
DOI:	10.1080/10826080701801543
Popis:	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.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.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.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.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.
Databáze:	OpenAIRE
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