Rasch analysis reveals problems with multiplicative scoring in the Macular Disease Quality of Life questionnaire
Finger, R P
Fenwick, Eva K
Lamoureux, Ecosse L
Holz, F G
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The multiplicative rating scale of the MacDQoL is flawed and does not provide scientific measurement of VRQoL. Measurement can be restored with a series of revisions to the instrument. This study reinforces the importance of considering rating scale design when choosing patient reported outcomes instruments for healthcare research.
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