Title |
Agreement between pre-post measures of change and transition ratings as well as then-tests
|
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Published in |
BMC Medical Research Methodology, March 2013
|
DOI | 10.1186/1471-2288-13-52 |
Pubmed ID | |
Authors |
Thorsten Meyer, Susanne Richter, Heiner Raspe |
Abstract |
Different approaches have been developed for measuring change. Direct measurement of change (transition ratings) requires asking a patient directly about his judgment about the change he has experienced (reported change). With indirect measures of change, the patients' status is assessed at different time points and differences between them are calculated (measured change). When using the quasi-indirect approach ('then-test'), patients are asked after an intervention to rate their statuses both before the intervention as well as at the time of the enquiry. Associations previous studies have found between the different approaches might be biased because transition ratings are generally assessed using a single, general item, while indirect measures of change are generally based on multi-item scales. We aimed to quantify the agreement between indirect and direct as well as indirect and quasi-indirect measures of change while using multi-item scales exclusively. We explored possible reasons for non-agreement (present-state bias, recall bias). |
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