Reliability analysis and factorial structure of spanish versión of TPQ (treatment perception questionnaire) in drug addiction treatment
DOI:
https://doi.org/10.20882/adicciones.416Keywords:
Reliabitity, Validity, Satisfaction, Treatment, Drugs, TPQAbstract
The Treatment Perception Questionnaire’ (TPQ) is a brief, self-administered scale designed to measure drug user satisfaction with the treatment programme they are following. The aim of this work is to analyse the internal consistency and reliability of the Spanish version of the TPQ, as well as the construct validity. A sample group of one hundred heroin users, diagnosed as opium dependents, treated in a Drugs Treatment Centre, was evaluated with TPQ. The results, registered and coded according to the original algorithms, were subjected to a principal components factor analysis (PCFA) with varimax rotation. The PCFA revealed a three factors solution stating 58.6% of the Explained Variance (EV). The first factor, named “readiness and trust in the treatment team”, assumed 33.4% EV and presented a Cronbach coefficient () of 0.62 and an Intraclass Correlation Coefficient (ICC) of 0.80. The second factor, with 13.9% of EV, referring to “trust and satisfaction with the treatment team and programme”, presents a = 0.71 and an ICC= 0.85. Lastly, the third factor, with an 11.2% of EV (= 0.56 and ICC= 0.81) groups together items which relate to “information reception and motivation for the treatment”. These results do not confirm the scope found by the TPQ authors, indicating that satisfaction with treatment must be addressed and assessed from a wider number of areas involved in such a process.References
Caminal J. La medida de la satisfacción: un instrumento de participación de la población en la mejora de la calidad de los servicios sanitarios. Rev Calidad Asistencial 2001; 16: 276-279.
Fitzpatrick R. Surveys of patient satisfaction: II-Designing a questionnaire and conducting a survey. BMJ 1991; 302: 1129-1132.
Mira JJ, Aranaz J. La satisfacción del paciente como una medida del resultado de la atención sanitaria. Med Clin (Barc) 2000; 114 (Supl 3): 26-33.
Pascoe CR. Patient satisfaction in primary healt care: A literature review and analysis. Eval Program Plann 1983; 6: 185-210.
James RE, Lindsay WL. Administración y control de calidad. México: Grupo Editorial Iberoamericano; 1995.
Marsden J, Nizzoli U, Corbelli C, Margaron H, Torres MA, Castro del Prado I, Stewart D, Gossop M. Fiabilidad del “Maudsley addiction profile” (MAP, ERIT- Versión) del “Treatment perceptions questionnaire” (TPQ) en Italia, España y Portugal para la evaluación de tratamientos. Adicciones 2001; 13: 217-227.
Rodríguez M, Jiménez-Lerma JM, Iraurgi I, Murua F, Bacigalupe L, Chavarri MR, Balsategi B. Evaluación de la Satisfacción con el Tratamiento en un Centro Ambulatorio de Drogodependencias a través del “Treatment Perception Questionnaire” (TPQ). Adicciones 2002; 14 (4): 1-8.
Pérez de los Cobos J, Valero S, Haro G, Fidel G, Escuder G, Trujols J, Valderrama JC. Development and psychometric properties of the Verona Service Satisfaction Scale for methadone-treated opioid-dependent patients (VSSS-MT). Drug Alcohol Depend 2002; 68(2): 209-214.
Marsden J, Stewart D, Gossop M, Rolfe A, Bacchus L, Griffiths P, Clarke K, Strang J. Assessing client satisfaction with treatment for substance use problems: Development of the Treatment Perceptions Questionnaire (TPQ). Addiction Research 2000; 8 (5): 455-470.
Nunnally JC, Berstein IJ. Teoría psicométrica. México: 3ª Edición. McGraw-Hill; 1995.11. Bartko, J.J. The intraclass correlation coefficient as a measure of reliability. Psychological Repport 1966; 19:3-11.
Prieto, L., Lamarca, R., Casado, A., Alonso, J. The evaluation of agreement on continuous variables bay the intraclass correlation. Journal Epidemiology and Community Health, 1997; 51(5): 579-580.
Prieto, L., Lamarca, R., Casado, A. La evaluación de la fiabilidad en las observaciones clínicas: el coeficiente de correlación intraclase. Med Clín (Barc) 1998; 110:142-145.
Norusis MJ. Statistical Package for the Social Sciences. Release 9. Chicago: SPSS Inc.; 2000.


