Correction to “Rasch‐built overall disability scale for POEMS syndrome (POEMS‐RODS)”

In Keh et al., ¹ the published version of this article has the wrong Figure 2. The correct and complete figure image is shown below.

FIGURE 2.

Category probability curves (CPC) (A, B) and item characteristic curves (ICC) plotting for differential item function (DIF) (C, D). In (A) and (B), the coloured lines display relative probability of participants responding “not possible to perform” (blue), “possible, but with some difficulty” (red), and “possible, without any difficulty” (green) over a range of person locations (person ability on a linear scale). (A) CPC for item “getting into a car” showing good threshold ordering ‐ this item was retained at this point (but removed later to reduce local dependency). (B) CPC for item “driving a car” shows disordering of thresholds, with the “possible, but with some difficulty” category (red line) never being the most probable to be observed at any point in the scale. This item was removed. (C) ICC plot for item “cycle a bike” shows significant DIF for gender, with male (red line) and female (blue line) participants displaying significant differences in responses at the same person location. This item was removed. (D) ICC plot for item “put on shoes” showed no significant DIF for gender, with male and female participants responding similarly at similar levels of ability. This item was retained.

We apologize for this error.