A Comparison of Traditional and Rasch Cut Points for Assessing Clinically Important Change in Health-Related Quality of Life among Patients with Asthma

Background: Patient-perceived change in health-related quality of life (HRQoL) domains has often been classified using a 15-point patient transition rating scale. However, traditional change levels of trivial (-1, 0, or 1), minimal (2, 3 or -2, -3), moderate (4, 5 or -4, -5) and large (6, 7 or -6, -...

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