Asthma symptom utility index: reliability, validity, responsiveness, and the minimal important difference in adult asthmatic patients.


BACKGROUND The evaluation of asthma symptoms is a core outcome measure in asthma clinical research. The Asthma Symptom Utility Index (ASUI) was developed to assess the frequency and severity of asthma symptoms. The psychometric properties of the ASUI are not well characterized, and a minimal important difference (MID) is not established. OBJECTIVES We… (More)
DOI: 10.1016/j.jaci.2012.07.058


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