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Additional data collection is planned to further test the performances of the custom PROMIS short forms in larger patient cohorts using IRT and adding newly calibrated items that may help discriminate at the very low end of physical functioning.
To be useful in patients with severe functional loss, the existing item bank may need to be enriched with newly calibrated items at the lower end of the scale, as indicated by the percentage of children scoring at the measurement floor on the custom short forms.
CAT software was then developed to utilise the calibrated items from each item bank.
Two Diabetes Knowledge Tests containing 19 multiple choice questions were used, developed from the same large pool of calibrated items as the DNAT.
We conducted differential item function (DIF) analyses among chief demographic and clinical groups to examine items for differences, and we calibrated items to an IRT model for use in CAT.
In the second phase, the items were evaluated in order to obtain a pool of calibrated items fitting the Rasch model (see below) and provisional best cut points for competence were established.
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Deploying CAT still causes high upfront effort for setting up a valid, calibrated item pool.
Higher values indicate higher severity; SE = standard error; rt = correlation between item and total measured social maladjustment level based on the Rasch calibrated item scores and total scores.
The initially calibrated item bank that was used for the development of the CAT Fatigue RA consisted of 196 items and 3 dimensions, which included all 12 dimensions that emerged from the Delphi study.
To overcome the lack of a test-fair, calibrated item bank for CVD patients, the present study aimed at the development and calibration of an item bank for the assessment of activities of daily living in cardiovascular patients (ADLib-cardio).
Based on existing questionnaires, the NIH Patient-Reported Outcomes Measurement Information System (PROMIS) project has developed large calibrated item banks that can be used to measure key symptoms and health concepts across a wide variety of chronic diseases and in the general population [ 47].
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