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Development of Japanese utility weights for the Adult Social Care Outcomes Toolkit (ASCOT) SCT4

Shiroiwa, Takeru, Moriyama, Yoko, Nakamura-Thomas, Hiromi, Morikawa, Mie, Fukuda, Takashi, Batchelder, Laurie, Saloniki, Eirini Christina and Malley, Juliette (2020) Development of Japanese utility weights for the Adult Social Care Outcomes Toolkit (ASCOT) SCT4. Quality of Life Research, 29 (1). 253 - 263. ISSN 0962-9343

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Identification Number: 10.1007/s11136-019-02287-6

Abstract

Purpose: In developed countries, progressive rapid aging is increasing the need for social care. This study aimed to determine Japanese utility weights for the Adult Social Care Outcomes Toolkit (ASCOT) four-level self-completion questionnaire (SCT4). Methods: We recruited 1050 Japanese respondents from the general population, stratified by sex and age, from five major cities. In the best–worst scaling (BWS) phase, respondents ranked various social care-related quality of life (SCRQoL) states as “best,” “worst,” “second-best,” or “second-worst,” as per the ASCOT. Then, respondents were asked to evaluate eight different SCRQOL states by composite time-trade off (cTTO). A mixed logit model was used to analyze BWS data. The association between cTTO and latent BWS scores was used to estimate a scoring formula that would convert BWS scores to SC-QALY (social care quality-adjusted life year) scores. Results: Japanese BWS weightings for ASCOT-SCT4 were successfully estimated and found generally consistent with the UK utility weights. However, coefficients on level 3 of “Control over daily life” and “Occupation” domains differed markedly between Japan and the UK. The worst Japanese SCRQoL state was lower than that for the UK, as Japanese cTTO results showed more negative valuations. In general, Japanese SC-QALY score (for more than 90% of health states) was lower than that for the UK. Conclusions: We successfully obtained Japanese utility weights for ASCOT SCT4. This will contribute to the measurement and understanding of social care outcomes.

Item Type: Article
Additional Information: © 2019 The Authors
Divisions: Personal Social Services Research Unit
Subjects: R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
H Social Sciences > HV Social pathology. Social and public welfare. Criminology
Date Deposited: 02 Oct 2019 11:27
Last Modified: 29 Jun 2020 23:24
URI: http://eprints.lse.ac.uk/id/eprint/101802

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