• Lisiane Fernanda Simeão de Azevedo, André Pontes-Silva, Renata Gonçalves Mendes, Claudio Donisete da Silva, Walkiria Shimoya-Bittencourt, Jussara Almeida de Oliveira Baggio, Maria Cláudia Gonçalves, Rita de Cássia Mendonça de Miranda, Almir Vieira Dibai-Filho, and Daniela Bassi-Dibai.
• Universidade Ceuma, Postgraduate Program in Environment - São Luís (MA), Brazil.
• Rev Assoc Med Bras (1992). 2023 Jan 1; 69 (4): e20221546e20221546.

ObjectiveThe aim of this study was to measure the reliability, internal consistency, and construct validity of the Kidney Symptom Questionnaire for the Brazilian population.MethodsThis is a cross-cultural adaptation and questionnaire validation study. We included native Brazilians of both sex aged>18 years, as well as hypertensive and/or diabetic patients. All participants were assessed using Screening for Occult Renal Disease, EuroQol 5 Dimensions, 36-Item Short Form Survey, and the Kidney Symptom Questionnaire. We used Spearman's coefficient (rho) to measure the correlations between the Kidney Symptom Questionnaire and other instruments; Cronbach's alpha to measure internal consistency; and intraclass correlation coefficient, standard error of measurement, and minimum detectable change to measure test-retest reliability.ResultsThe sample was formed by 121 adult participants, mostly female, with systemic arterial hypertension and/or diabetes mellitus. We found excellent reliability (intraclass correlation coefficient≥0.978), adequate internal consistency (Cronbach's alpha≥0.860), and adequate construct validity on the Kidney Symptom Questionnaire domains; besides, we observed significant correlations between the Kidney Symptom Questionnaire and other instruments.ConclusionThe Brazilian version of the Kidney Symptom Questionnaire has adequate measurement properties to assess chronic/occult kidney disease in patients who do not require renal replacement therapy.

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