Estimating and Testing an Index of Responsiveness and the Relationship of the Index to Power

Overview

Journal J Clin Epidemiol

Publisher Elsevier

Specialty Public Health

Date 1991 Jan 1

PMID 2010785

Citations 16

Authors

M R Tuley

C D Mulrow

C A McMahan

Affiliations

Soon will be listed here.

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.

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