Translation, cultural adaptation, and initial reliability and multitrait testing of the Kidney Disease Quality of Life instrument for use in Japan

Citation
J. Green et al., Translation, cultural adaptation, and initial reliability and multitrait testing of the Kidney Disease Quality of Life instrument for use in Japan, QUAL LIFE R, 10(1), 2001, pp. 93-100
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Health Care Sciences & Services
Journal title
QUALITY OF LIFE RESEARCH
ISSN journal
0962-9343 → ACNP
Volume
10
Issue
1
Year of publication
2001
Pages
93 - 100
Database
ISI
SICI code
0962-9343(2001)10:1<93:TCAAIR>2.0.ZU;2-H
Abstract
Background: The Kidney Disease Quality of Life instrument (KDQOL(TM)) consi sts of 79 items: 36 asking about health-related quality of life (HRQOL) in general (the Medical Outcomes Study SF-36) and 43 asking about QOL as it is affected by kidney disease and by dialysis. Aim: Translation, cultural ada ptation and initial reliability and multitrait testing of the KDQOL(TM) for use in Japan. Methods: Translation and cultural adaptation began with two translations into Japanese, two backtranslations into English, and discussi ons among the translators, the project coordinators in Japan, and the devel opers of the original (US-English) version. Focus-group discussions and fie ld testing were followed by analyses of test-retest reliability, internal c onsistency, and convergent and discriminant construct validity. Results: Al l eight of the SF-36 scales met the criterion for internal consistency (Cro nbach's alpha ranged from 0.73 to 0.92) and were reproducible (intraclass c orrelations between test and retest scores ranged from 0.60 to 0.82). Of th e 10 kidney-disease-targeted scales, only two had alpha coefficients of les s than 0.70: 'sleep' (0.61) and 'quality of social interaction' (0.35). One item on the 'quality of social interaction' scale had a very weak correlat ion with the remainder of that scale (r = 0.10). Eliminating that item from scoring increased the alpha coefficient of the scale from 0.35 to 0.64. Al l three items on the 'quality of social interaction' scale had very strong correlations with other scales. Conclusions: First, in Japanese patients re ceiving dialysis the SF-36 scales are internally consistent and their score s are reproducible. Second, with the possible exception of the 'quality of social interaction' scale, the Japanese version of the KDQOL(TM),can provid e psychometrically sound kidney-disease-targeted data on quality of life in such patients.