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which dimensions of health are important, the nature of the patient group and about the content of possible instruments [1-3].
It is difficult to give general recommendations as to what makes an instrument appropriate for a given application, because this ultimately depends on the users' specific questions and the content of instruments.
(Back to top) Acceptability is the extent to which an instrument is acceptable to patients.
It is also important to consider how broad a measure of health is required.
Specific instruments can have a very restricted focus on symptoms and signs of disease, but may also take account of the impact of disease on quality of life.
Patient Reported Outcome Measures (PROMs) can have three broad measurement objectives: discrimination, evaluation and prediction .
Discrimination is concerned with the measurement of differences between patients when there is no external criterion available to validate the instrument.
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For example, Patient Reported Outcome Measures (PROMs) administered before and after treatment, are used as outcome measures in clinical trials.