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Vol. 102. Issue 1.
Pages 28-38 (January - February 2011)
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Vol. 102. Issue 1.
Pages 28-38 (January - February 2011)
Original article
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Design and Validation of a Questionnaire to Measure Treatment Satisfaction in Patients With Moderate-to-Severe Psoriasis: the NEODERMA Study
Diseño y validación de un cuestionario para medir la satisfacción con el tratamiento del paciente con psoriasis moderada y grave: estudio NEODERMA
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7148
M. Riberaa,
Corresponding author
miquel.ribera@uab.cat

Corresponding author.
, E. Daudénb, L. Puigc, V. García-Patos Brionesd, J.M. Herranze, X. Bordasf, F. Vanaclochag, on behalf of the NEODERMA Study Group
a Servicio de Dermatología, Hospital Universitari de Sabadell, Corporació Parc Taulí, Sabadell, Barcelona, Spain
b Servicio de Dermatología, Hospital de la Princesa, Madrid, Spain
c Servicio de Dermatología, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
d Servicio de Dermatología, Hospital de la Vall d’Hebron, Barcelona, Spain
e Servicio de Dermatología, Hospital Infanta Leonor, Madrid, Spain
f Servicio de Dermatología, Hospital de Bellvitge, L’Hospitalet de Llobregat, Barcelona, Spain
g Servicio de Dermatología, Hospital 12 de Octubre, Madrid, Spain
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Abstract
Background and objectives

The aim of this study was to design and assess the validity, reliability, and sensitivity to change of the Spanish Satisfaction With Treatment of Psoriasis Questionnaire (SSTPQ) for use in patients with moderate-to-severe psoriasis.

Patients and methods: A prospective, multicenter, observational, naturalistic study was designed. The instrument consisted of 12 items scored on a 5-point Likert scale with scores from 0 (very satisfied) to 5 (very unsatisfied), generating a total score of 0 to 48. Patients completed the questionnaire at baseline and then at 3-, 6-, 9-, and 12-month follow-up. At each visit, data were also collected on the Psoriasis Area and Severity Index (PASI), treatment adherence (Morisky-Green questionnaire), and overall treatment satisfaction on a Visual Analogue Scale (VAS) from 0 to 100.

Results

A total of 423 patients were included in the study and 68% completed 12 months of follow-up. Responses were provided to all items in 98.8% of cases. There was a weak correlation between changes in treatment satisfaction on the SSTPQ and changes in PASI score (r=0.38 to 0.33); in contrast, there were strong correlations with changes in the VAS score for overall treatment satisfaction (r=–0.75 to –0.81). Good internal consistency was observed (Cronbach α=0.92). The intraclass correlation coefficient was 0.89, with a mean difference in score at 3- and 6-month follow-up of 0.07.

Conclusions

The results obtained suggest that the SSTPQ is a feasible, valid, and reliable tool for the assessment of treatment satisfaction in patients with moderate-to-severe psoriasis.

Keywords:
Satisfaction questionnaire
Treatment
Psoriasis
Validity
Reliability
Spanish Satisfaction With Treatment of Psoriasis Questionnaire (SSTPQ)
Resumen
Introducción y objetivos

El objetivo del estudio fue diseñar y evaluar la validez, fiabilidad y sensibilidad al cambio de un cuestionario de satisfacción del tratamiento para el paciente con psoriasis moderada y grave, denominado CESTEP (Cuestionario Español de Satisfacción de Tratamiento en Psoriasis).

Pacientes y métodos

Se diseñó un estudio observacional, prospectivo, naturalístico y multicéntrico. El cuestionario estaba formado por 12 ítems, cada uno de los cuales se valoraba con una escala de tipo Likert con respuestas puntuables de 0 (muy satisfecho) a 5 (muy insatisfecho) (puntuación total de 0 a 48). Los pacientes cumplimentaron el cuestionario de satisfacción en la visita basal y a los 3, 6, 9 y 12 meses de seguimiento. En cada visita se recogieron también las variables clínicas (índice PASI), la adherencia con el tratamiento (cuestionario Morisky-Green) y la valoración global de la satisfacción con el tratamiento mediante una escala analógica visual (EAV) de 0 a 100.

Resultados

Se incluyeron un total de 423 pacientes, de los cuales el 68% finalizaron los 12 meses de seguimiento. El 98,8% de los pacientes completaron todas las preguntas del cuestionario. Los cambios en el cuestionario de satisfacción y en el índice PASI durante el estudio se correlacionaron de manera baja (r de 0,38 a 0,33), pero se observaron, en cambio, correlaciones altas con los cambios en la EAV de satisfacción (r de −0,75 a −0,81). Se obtuvo una buena consistencia interna (α de Cronbach de 0,92). El coeficiente de correlación intraclase era de 0,89, con una diferencia media en las puntuaciones, entre la visita a los 3 meses y a los 6 meses de 0,07 puntos.

Conclusiones

Los resultados obtenidos indican que el cuestionario CESTEP para la evaluación de la satisfacción del tratamiento en pacientes con psoriasis moderada y grave puede ser utilizado para tal finalidad, ya que se ha mostrado factible, válido y fiable.

Palabras clave:
Cuestionario de satisfacción
Tratamiento
Psoriasis
Validez
Fiabilidad
CESTEP
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See Appendix 1 for a list of the members of the NEODERMA Study Group.

Copyright © 2011. Academia Española de Dermatología y Venereología and Elsevier España, S.L.
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