Finally, visitors can find items by area of coverage, publisher, and year of publication, with items dating back as far as 2002.
These experts identified inappropriate items, ensured adequacy of coverage of all relevant content areas, and recommended rewording of certain items.
The item-person maps showed 71.3% of item coverage for the urinary symptoms domain and 13 42.7% for the other three domains.
Breadth of item coverage for the OA-FUNCTION-CAT functional difficulty and functional pain item banks and corresponding WOMAC scales is shown in Figure 2. Item coverage is displayed as the range of a person's scores that correspond to the highest and lowest values of expected item response categories in each scale.
Such a tool has the advantage of providing consistency in item structure; coverage of all relevant care domains; information about the person's needs to guide care planning and the ability to build a robust set of outcome products such as case-mix groupings, quality indicators and eligibility determinants [ 5].
Because we aimed to provide an efficient test instrument with a small number of items, good coverage of the average ability range was considered more important than good coverage of the extreme regions.
Item fit, item stability, coverage of item content and person measure (item-person map), and item targeting were evaluated.
Because you often have to get items appraised to get them scheduled, this approach helps ensure you get the right amount of coverage for an item.
To evaluate breadth of coverage, we calculated item distributions and percentage at the ceiling and floor for each scale of the full item bank compared with the WOMAC.
In such an endeavour, IRT-methods for item specific weights and the issue of coverage should be considered.
