St George's Respiratory Questionnaire (SGRQ) has been widely used in the assessment of health related quality of life (HRQOL) in patients with asthma and chronic obstructive pulmonary disease. Introduction of the new language version of the HRQOL questionnaire needs to be preceded by a highly structured process of validation. We aimed to validate the Polish version of SGRQ in the group of 83 patients with asthma. Following the comprehension study, we thus evaluated reliability, validity, reproducibility, responsiveness, and measurement equivalence of the Polish version of SGRQ. Disease severity and health status were also concurrently assessed. The reliability was good, with Cronbach's alpha coefficient exceeding 0.75 for global and all subscale scores. There have been highly significant correlations between spirometric parameters, intensity of symptoms, health status self-assessment, and the degree of depression, and quality of life scores. Reproducibility, stability and responsiveness were confirmed in the follow-up study. Minimal clinically important difference was found to be 5.3 points. Polish version of SGRQ was found to be psychometrically equivalent to four other versions of SGRQ, which underscores its validity in the population of Polish asthmatics.
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