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Proportional change: an additional method of reporting technical and functional outcomes following clinical interventions
Author(s) -
Blair E. M.,
Love S. C.,
Valentine J. P.
Publication year - 2001
Publication title -
european journal of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.881
H-Index - 124
eISSN - 1468-1331
pISSN - 1351-5101
DOI - 10.1046/j.1468-1331.2001.00050.x
Subject(s) - psychological intervention , medicine , set (abstract data type) , value (mathematics) , likert scale , intervention (counseling) , physical therapy , statistics , mathematics , computer science , psychiatry , programming language
One of the major challenges in disability management research is to express results in a manner that can be generalized to subjects with varying degrees of disability. Absolute measurements of change are often dependent on initial characteristics, in which case they can only be generalized to subjects with the same characteristics. We define proportional change as the ratio of change to the maximum possible or targeted change. It can be assessed in any situation where a maximum possible or targeted change is definable. Its estimated value will be sensitive to the choice of denominator. Subjective assessments, such as those measured with Likert scales, are naturally expressed as proportional change with the denominator being set by the subject. Denominators may also be determined objectively by physical limitations or, less desirably, by the measurement tool. Where there is no readily or objectively determinable denominator, they should be chosen for each subject in advance of the intervention according to carefully specified criteria. Proportional change is proposed, as an adjunct to the reporting of absolute measures of change following therapeutic interventions, as a means of expressing change in a manner that is both individualized and generalizable.