Cross-cultural adaptation of the Richards-Campbell Sleep Questionnaire for intensive care unit inpatients in Brazil: internal consistency, test-retest reliability, and measurement error.

Study Objectives: To perform the cross-cultural adaptation of the Richards-Campbell sleep questionnaire (RCSQ) to Portuguese-Brazil and to eval its internal consistency, test-retest reliability, and measurement error in intensive care unit (ICU) inpatients.

Methods: The study enrolled 113 inpatients at medical/surgical ICU in Curitiba, Brazil. The RCSQ was first translated to Portuguese-Brazil according to the principles of good practice for the translation and cultural adaptation process for patient-reported outcomes and then applied in 30 inpatients.