Bladder cancer index: Cross-cultural adaptation into Spanish and psychometric evaluation

Stefanie Schmidt, Ricard Riel, Albert Frances, José A. Lorente Garin, Xavier Bonfill, María J. Martinez-Zapata, Maria Morales Suarez-Varela, Javier dela Cruz, José I. Emparanza, María José Sánchez, Javier Zamora, Juan Manuel R. Goñi, Jordi Alonso, Montse Ferrer, Virginia Becerra, Yolanda Pardo, Montserrat Ferrer Fores, Olatz Garin, Carola Orrego Villagran, Rosa SuñolDimelza Osorio, Xavier Bonfill Cosp, Esther Canovas, Gemma Sancho Pardo, Ignasi Bolívar, Jordi Bachs, José Pablo Maroto, M. Jesús Quintana, M. José Martínez Zapata, Cristina Martin Lorente, Ferran Algaba, Palou Redorta, Salvador Esquena, Fundació Puigvert, Robin Vernooij, Amaia Martínez, José Ignacio Pijoan Zubizarreta, Lorea Martínez, David Manuel Castro Diaz, Julio López Bastida, Armando Suárez Pacheco, Cesar García López, Jose Manuel Cozar Olmo, Carmen Martínez, Daysy Chang Chan, M. Jose Sanchez Perez, Ana Isabel Díaz Moratinos, Angel Montero Luis, Asunción Hervás, Carmen Vallejo Ocaña, Costantino Varona, Javier Burgos, Jose Alfredo Polo Rubio, Luis López-Fando Lavalle, Miguel Angel Jimenez Cidre, Alfonso Muriel Garcia, Nieves Plana Farras, Rosa Morera Lopez, Sonsoles Sancho Garcia, Victor Abraira, Victoria Gomez Dos Santos, Agustín Gómez De la Cámara, Javier De la Cruz, Juan Passas Martinez, Humberto García Muñoz, M. Ángeles Cabeza Rodríguez, Irune Ruiz Díaz, Juan Pablo Sanz Jaka, M. José Velásquez, Agustin LLopis González, María Morales, Carlos Camps, Cristina Caballero Díaz, Emilio Marqués Vidal, Francisco Sánchez Ballester, Joaquin Ulises Juan Escudero, Jorge Pastor Peidro, José López Torrecilla, M. Macarena Ramos Campos, Miguel Martorell Cebollada

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15 Citations (Scopus)

Abstract

Background: The Bladder Cancer Index (BCI) is so far the only instrument applicable across all bladder cancer patients, independent of tumor infiltration or treatment applied. We developed a Spanish version of the BCI, and assessed its acceptability and metric properties. Methods: For the adaptation into Spanish we used the forward and back-translation method, expert panels, and cognitive debriefing patient interviews. For the assessment of metric properties we used data from 197 bladder cancer patients from a multi-center prospective study. The Spanish BCI and the SF-36 Health Survey were self-administered before and 12 months after treatment. Reliability was estimated by Cronbach's alpha. Construct validity was assessed through the multi-trait multi-method matrix. The magnitude of change was quantified by effect sizes to assess responsiveness. Results: Reliability coefficients ranged 0.75-0.97. The validity analysis confirmed moderate associations between the BCI function and bother subscales for urinary (r = 0.61) and bowel (r = 0.53) domains; conceptual independence among all BCI domains (r ≤ 0.3); and low correlation coefficients with the SF-36 scores, ranging 0.14-0.48. Among patients reporting global improvement at follow-up, pre-post treatment changes were statistically significant for the urinary domain and urinary bother subscale, with effect sizes of 0.38 and 0.53. Conclusions: The Spanish BCI is well accepted, reliable, valid, responsive, and similar in performance compared to the original instrument. These findings support its use, both in Spanish and international studies, as a valuable and comprehensive tool for assessing quality of life across a wide range of bladder cancer patients. © 2014 Schmidt et al.; licensee BioMed Central Ltd.
Original languageEnglish
Article number20
JournalHealth and Quality of Life Outcomes
Volume12
DOIs
Publication statusPublished - 15 Feb 2014

Keywords

  • Patient outcomes
  • Psychometrics
  • Quality of life
  • Urinary bladder neoplasms
  • Validation studies

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