Adapted Bland-Altman method was used to compare measurement methods with unequal observations per case
Publication year
2015Source
Journal of Clinical Epidemiology, 68, 8, (2015), pp. 939-43ISSN
Publication type
Article / Letter to editor

Display more detailsDisplay less details
Organization
Geriatrics
Health Evidence
Journal title
Journal of Clinical Epidemiology
Volume
vol. 68
Issue
iss. 8
Page start
p. 939
Page end
p. 43
Subject
Radboudumc 0: Other Research RIHS: Radboud Institute for Health Sciences; Radboudumc 18: Healthcare improvement science RIHS: Radboud Institute for Health SciencesAbstract
OBJECTIVES: To describe an adjustment of the Bland-Altman approach to evaluate possible patterns of discord between two measurement methods with an unequal number of observations per case. STUDY DESIGN AND SETTING: Two methods of adaptation were compared using self-assessed general well-being scores (one individual rater) and scores given by multiple external raters for illustration. Both empirical data derived from the Older Person's Relevant Outcome of Care Score study and simulated data were used. RESULTS: When the mean of a number of assessments [X] is compared with a single assessment [Y], the variation [X - Y] (vertical axis) will be correlated with the mean of X and Y (horizontal axis) because the means of scores given by a larger group of raters tend to be less extreme than the scores given by individual raters. In contrast, in the absence of discord patterns, the variation [X - Y] will not be correlated with the mean of all observations Xi and Yj made irrespective of who made them as denominator in the Bland-Altman plot. Thus, the second approach should be used for the valuation. CONCLUSION: The Bland-Altman approach needs correct adaptations, else artificial biases may occur.
This item appears in the following Collection(s)
- Academic publications [227864]
- Faculty of Medical Sciences [86218]
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.