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. 2017 Aug 15;3(3):2055217317725917. doi: 10.1177/2055217317725917

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Exemplar item characteristic curve (ICC).

The ICC plots the scores expected by the Rasch model for each individual item on the y-axis at each and every level of the measurement continuum of Physical Impact (x-axis). The black dots represent observed scores in each of the 10 class intervals of the trait (i.e. Physical Impact). This ICC for Item 9 indicates slight under-discrimination of the trait, as the line indicated by the dots is flatter than the expected curve. Individuals with higher impact (right hand-side of the continuum) scored lower than expected denoting lower impact, while patients with lower impact (left hand-side of the continuum) scored higher than expected denoting more impact.