We used item response theory (IRT) to construct and evaluate a preliminary item bank for physical function assuming four subdomains.
Our procedure uses a three-test design, which enables us to additionally evaluate whether an item reminisced early (say, during a deposition) is more likely to be accurate than an item reminisced later (say, during court).
In the phonological lexical decision task, we presented words, pseudohomophones, and pseudowords (90 items each) and asked the participants to evaluate whether an item corresponds to an existing word (i.e., "Does xxx sound like an existing word?").
In order to evaluate whether an item correlates more strongly with its own factor than with any other factor (discriminant validity), we followed an approach by Fornell and Larcker [ 37], which entails that the square root of the average variance extracted (AVE) should be higher than the inter-correlations with the other scales identified in the model.
In these experiments, subjects typically evaluated an offered item (say a food) and experimenters identified brain regions where the fMRI signal tracked subjective value (e.g., willingness to pay for the item).
This is quite different from evaluating a short item of given information and choosing from a set of multiple-choice responses.
In 2007, Vedam et al. developed and evaluated a 20 item Provider Attitudes towards Planned Home Birth scale (PAPHB) [ 34], and applied it to Certified Nurse-Midwives (CNMs), in the United States [ 35].
Health services at POE do monitor and evaluate a range of items as well as people entering or leaving the country.
Pain was evaluated using an item adapted from the pain-intensity items of the Chronic Pain Grade scale.
Therefore, blinding will not be part of the inclusion criteria, although it will be evaluated as an item in the risk of bias assessment.
