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This line of reasoning is confirmed by the fact that the bathing personal care ADL appears in the top 3rd of most difficult items for the Fortinsky et al. scale.
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CAM3 (disorganized thought) seemed the most difficult item for the family physicians in terms of differentiating between delirium and non-delirium patients.
Additionally being aware of the ordering of difficulty makes it possible for clinicians to tailor their assessments according to severity level, e.g., selecting less difficult items for patients with established dementia and the more difficult items for healthy elderly or those with mild or early stages of cognitive impairment [ 8].
However the questionnaire items relating to "Work importance" and "Work impact" had outfit msnq values of 2.36 and 2.06 respectively meaning that they were the most "difficult" items for participants to endorse.
To illustrate, a test composed of only too easy or too difficult items for particular groups would not be very informative about the ability of the test takers in those groups; in other words, the test would fail to discriminate the test taker's ability on the subject.
The MAL and ABILHAND contained more difficult items for active function, evaluating a wide range of activities, including unilateral and bimanual function.
Underlying tasks of the 'Feeling fit scale' typically represent difficult items for visually impaired persons (as revealed from focus group discussions), providing better insight into vision-related fatigue problems compared to the 'physical fatigue' of the SFQ.
These procedures also identified a need for more difficult items for fifth-grade students (version A).
It is also interesting because some of the experts asked for more difficult items in the item sample.
The floor or ceiling effects can also results from an item distribution more spread out than the latent variable distribution where the easy items will be too easy and the difficult items will be too difficult for the population.
For this situation to change, more "difficult" items are needed in the scale items that would be difficult for respondents to agree with and therefore permit better assessment at the high end of the score continuum.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com