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Erschienen in: Quality of Life Research 12/2019

27.07.2019

Mapping the Shah-modified Barthel Index to the Health Utility Index Mark III by the Mean Rank Method

verfasst von: Yin Bun Cheung, Hui Xing Tan, Nan Luo, Hwee Lin Wee, Gerald C. H. Koh

Erschienen in: Quality of Life Research | Ausgabe 12/2019

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Abstract

Purpose

To map the Shah-modified Barthel Index (SBI) to the Health Utility Index Mark III (HUI-3) in stroke patients, and to compare the performance of a recently developed method called the Mean Rank Method (MRM) against a popular method, the Ordinary Least Squares (OLS) method.

Methods

A cohort of 473 patients who had their first clinical stroke diagnosis and hospital admission and were assessed using the SBI and HUI-3 at 3 months and/or 12 months post-admission. Observations were split to form a training dataset (N = 473) and a validation dataset (N = 245).

Results

In the training dataset, the MRM using SBI total score as the predictor produced a mapped utility distribution that closely resembled the observed utility distribution. It had almost no shrinkage of the standard deviation (P = 0.542), whereas the OLS using SBI total score and SBI item scores under-estimated the standard deviation by 28% and 26%, respectively (each P < 0.001). The MRM mapping gave better fit in terms of smaller mean absolute error and larger intra-class correlation than the two versions of OLS mapping, whereas the OLS gave smaller mean-squared errors than the MRM. Multivariate regression analysis showed that the use of OLS-mapped utilities tended to under-estimate both the mean utility of people who had no comorbidity and the utility-comorbidity association as compared to the observed utility-comorbidity pattern although the differences did not reach statistical significance (each P > 0.05). The MRM-mapped utility showed utility-comorbidity pattern more similar to the observed. Similar findings were obtained from the validation dataset.

Conclusions

The MRM performed well. Mapping functions are available to map the SBI to the HUI-3 Utility Index.
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Metadaten
Titel
Mapping the Shah-modified Barthel Index to the Health Utility Index Mark III by the Mean Rank Method
verfasst von
Yin Bun Cheung
Hui Xing Tan
Nan Luo
Hwee Lin Wee
Gerald C. H. Koh
Publikationsdatum
27.07.2019
Verlag
Springer International Publishing
Erschienen in
Quality of Life Research / Ausgabe 12/2019
Print ISSN: 0962-9343
Elektronische ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-019-02254-1

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