Wagner Florentin Aguiar1, Leandro Cruz Mantoani1, Humberto Silva1, Camile Ludovico Zamboti1, Thatielle Garcia1, Vinicius Cavalheri2, Marcos Ribeiro3, Janelle Yorke4, Fabio Pitta1, Carlos Augusto Camillo5. 1. Laboratory of Research in Respiratory Physiotherapy, Department of Physiotherapy, State University Londrina, PR, Brazil. 2. School of Physical Therapy and Exercise Science, Faculty of Health Sciences, Curtin University, Perth, Australia; Allied Health, South Metropolitan Health Service, Perth, Australia. 3. Section of Pulmonology, Department of Medicine, State University Londrina, PR, Brazil. 4. Division of Nursing, Midwifery and Social Work, University of Manchester, Manchester, UK. 5. Laboratory of Research in Respiratory Physiotherapy, Department of Physiotherapy, State University Londrina, PR, Brazil; Department of Rehabilitation Sciences, University Pitágoras UNOPAR, Londrina, PR, Brazil.
Abstract
BACKGROUND: The idiopathic pulmonary fibrosis-specific version of the St George's Respiratory Questionnaire (SGRQ-I) is a valid tool to assess health-related quality of life in patients with interstitial lung diseases (ILDs). OBJECTIVE: To translate and cross-culturally adapt the SGRQ-I to Brazilian-Portuguese, and to assess its measurement properties. METHODS: Phase one consisted of the translation and cross-cultural adaptation of the questionnaire. In phase two, intra- and inter-assessor reliability (intraclass correlation coefficient [ICC]), internal consistency (Cronbach's α), minimal detectable change (MDC), ceiling/floor effects, convergent validity (correlation with SF-36 questionnaire), and discriminative validity (according to clinical characteristics) were investigated. RESULTS: No significant adaptations were needed during the translation process of the SGRQ-I. In phase two, 30 patients with ILD were included (15 men; age 59 ± 10 years; Forced Vital Capacity 73 [61-80]%predicted). The total score on the SGRQ-I presented excellent intra-assessor (ICC: 0.93; 95%CI: 0.85, 0.97]) and inter-assessor (ICC: 0.88; 95%CI: 0.77, 0.94) agreement. Internal consistency was considered adequate for the domains impact, activity, and total score (0.79<α<0.88) but not for symptoms (α=0.43). MDC was 12.8 points and ceiling/floor effects were found in only 3% of patients. No discriminative validity was observed, but there was adequate convergent validity. CONCLUSION: The results provide preliminary evidence of adequate measurement properties and validity of the Brazilian-Portuguese version of the SGRQ-I for patients with ILDs.
BACKGROUND: The idiopathic pulmonary fibrosis-specific version of the St George's Respiratory Questionnaire (SGRQ-I) is a valid tool to assess health-related quality of life in patients with interstitial lung diseases (ILDs). OBJECTIVE: To translate and cross-culturally adapt the SGRQ-I to Brazilian-Portuguese, and to assess its measurement properties. METHODS: Phase one consisted of the translation and cross-cultural adaptation of the questionnaire. In phase two, intra- and inter-assessor reliability (intraclass correlation coefficient [ICC]), internal consistency (Cronbach's α), minimal detectable change (MDC), ceiling/floor effects, convergent validity (correlation with SF-36 questionnaire), and discriminative validity (according to clinical characteristics) were investigated. RESULTS: No significant adaptations were needed during the translation process of the SGRQ-I. In phase two, 30 patients with ILD were included (15 men; age 59 ± 10 years; Forced Vital Capacity 73 [61-80]%predicted). The total score on the SGRQ-I presented excellent intra-assessor (ICC: 0.93; 95%CI: 0.85, 0.97]) and inter-assessor (ICC: 0.88; 95%CI: 0.77, 0.94) agreement. Internal consistency was considered adequate for the domains impact, activity, and total score (0.79<α<0.88) but not for symptoms (α=0.43). MDC was 12.8 points and ceiling/floor effects were found in only 3% of patients. No discriminative validity was observed, but there was adequate convergent validity. CONCLUSION: The results provide preliminary evidence of adequate measurement properties and validity of the Brazilian-Portuguese version of the SGRQ-I for patients with ILDs.
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