title: Estimating and testing an index of responsiveness and the relationship of the index to power.
abstract: Responsiveness has been proposed as a criterion, in addition to reliability and validity, to evaluate instruments that measure quality of life or functional status. The responsiveness index measures the change in a quality of life score due to a treatment relative to the variability of changes in that score within a stable control group. We derive the expected value, variance and distribution of the responsiveness index and give a large sample distribution for comparing the responsiveness of two different instruments. We also give the relationship between the responsiveness index and the power of a test of treatment effect.
authors.affiliation: Little Rock Health Services Research and Development Field Program, John L. McClellan Memorial Veterans Hospital, San Antonio, TX 78284.
authors.forename: M R
authors.initials: MR
authors.lastname: Tuley
authors.forename: C D
authors.initials: CD
authors.lastname: Mulrow
authors.forename: C A
authors.initials: CA
authors.lastname: McMahan
mesh_terms: D006310:Hearing Aids / Q000523:psychology*; D006311:Hearing Disorders / Q000523:psychology*; D006801:Humans; D011788:Quality of Life; D011897:Random Allocation; D013223:Statistics as Topic; D011795:Surveys and Questionnaires