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In addition, criterion validity was demonstrated for a majority of task-oriented questions.
To estimate test-retest reliability in the task-oriented questions, we used Cohen's weighted kappa.
In the local demonstration study, we simplified the task-oriented questions about PC use by limiting them to EMR only.
Moderately high correlations were consistently found between a majority of task-oriented questions and overall questions on EMR use, task performance and user satisfaction.
Work tasks found irrelevant by the physicians could have been identified by analyses of internal consistency among the task-oriented questions, e.g. Crohnbach's alpha[ 22].
Instead of performing another survey, we chose to explore the tasks as well as the task-oriented questions in a structured interview study.
However, some of the task-oriented questions about EMR use were found difficult to answer, particularly for the higher-level tasks.
This way of correlating a set of lower-level task-oriented questions to higher-level questions is commonly used as criterion validation [ 22].
In the test-retest study, we measured reliability by calculating Cohen's weighted kappa (quadratic weights) for all task-oriented questions.
Nine of the 24 task-oriented questions about EMR use were found difficult to answer by 2 4 of 10 physicians (figure 2, part C).
Overall, the task-oriented questions had a low percentage of missing responses both in the national and in the local demonstration study.
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