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Figure 1 | Health and Quality of Life Outcomes

Figure 1

From: Validation of a mobility item bank for older patients in primary care

Figure 1

Four examples of different characteristic option curves. Characteristic option curves sorted by degree of difficulty (top-down: lowest to highest difficulty) and by type of rating scale (from left to right: A = No difficulty; Some difficulty; Much difficulty; Unable to do. B = No difficulty; Some difficulty; Much difficulty + Unable to do. C = No difficulty; Some difficulty + Much difficulty; Unable to do). The first item was very easy and was unsuitable for the sample, although with rating scale type C it showed good behaviour. The second and third items only presented the desired features with rating scale type C, while the fourth one showed the desired features with rating scale types B and C.

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