Fig. 2. Item-person map of the EQ-5D (left) versus the five items of the WHOQOL-BREF (right). The graph represents item difficulty measures on the right side of each map with 0–100 converted score and the person ability measures on the left side following the Rasch analysis. Each analysis is anchored on the average item difficulty measure to 50 for comparisons. The ‘M’ represents the average item calibrations for both instruments. WHOQOL-BREF, World Health Organization Quality of Life; EQ-5D, EuroQOL-5 dimension.
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