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Development of a scale for the evaluation of the quality of the shared decision process in multiple sclerosis patients

Author

Listed:
  • Elena Álvarez-Rodríguez
  • César Manuel Sánchez-Franco
  • María José Pérez-Haro
  • Laura Bello-Otero
  • Marta Aguado-Valcarcel
  • Inés González-Suárez

Abstract

In the last years, therapeutic decisions in multiple sclerosis (MS) have become challenging due to expanded options with different treatment profiles attending to efficacy, safety, and route and frequency of administration. Moreover, patients with multiple sclerosis (PwMS) increasingly wish to be involved in their therapeutic decision process. Therefore, a new, patient-centric shared decision model (SDM), is gaining relevance. However, validated scales oriented to assess the quality of the process itself are lacking. The AGA-25 scale is a fit-for-purpose 25-item scale based on two validated scales in MS (Treatment Satisfaction Questionnaire for Medication (TSQM) and Decisional Conflict Scale (DCS)). The aim of this work is to develop and validate the AGAS-25 in Spanish. Two hundred and three PwMS (aged 17 to 67; 155 [76.4%] females) undergoing stable disease modifying treatment in the last 6 months were consecutively recruited. The Principal Component Analysis suggested a four-factor structure for the 25-item version of the questionnaire: 1) satisfaction with the SDM process 2) adverse events with the DMT, 3) convenience of the chosen-DMT and 4) information reliability. The internal consistency of the measurement was adequate (Cronbach’s alpha = 0.88). Our results support the use of the AGAS-25 scale to assist SDM in Spanish-speaking PwMS.

Suggested Citation

  • Elena Álvarez-Rodríguez & César Manuel Sánchez-Franco & María José Pérez-Haro & Laura Bello-Otero & Marta Aguado-Valcarcel & Inés González-Suárez, 2022. "Development of a scale for the evaluation of the quality of the shared decision process in multiple sclerosis patients," PLOS ONE, Public Library of Science, vol. 17(5), pages 1-11, May.
    • Handle: RePEc:plo:pone00:0268125
    DOI: 10.1371/journal.pone.0268125
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    References listed on IDEAS

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