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01-11-2013 | Brief Communication | Uitgave 9/2013

Quality of Life Research 9/2013

Reliability and validity of the English (Singapore) and Chinese (Singapore) versions of the Short-Form 36 version 2 in a multi-ethnic Urban Asian population in Singapore

Tijdschrift:
Quality of Life Research > Uitgave 9/2013
Auteurs:
Julian Thumboo, Yi Wu, E-Shyong Tai, Barbara Gandek, Jeannette Lee, Stefan Ma, Derrick Heng, Hwee-Lin Wee

Abstract

Purpose

We aimed to evaluate the measurement properties of the Singapore English and Chinese versions of the Short-Form 36 version 2 (SF-36v2) Questionnaire, an improved version of the widely used SF-36, for assessing health-related quality of life (HRQoL) in a multi-ethnic urban Asian population in Singapore.

Methods

SF-36v2 scores and data on medical history, demographic and lifestyle factors from the Singapore Prospective Study Programme were analyzed. Convergent and divergent validity, internal consistency, floor and ceiling effects, known group validity and factor structure of the SF-36v2 were assessed for the English and Chinese versions, respectively.

Results

Complete data for 4,917 participants (45.8 %) out of 10,747 eligible individuals were analyzed (survey language: 4,115 English and 802 Chinese). Item-scale correlations exceeded 0.4 for all items of the English SF-36v2 and for all except one item of the Chinese SF-36v2 (bathe and dress: item-scale correlation: 0.36). In the English SF-36v2, Cronbach’s alpha exceeded 0.70 for all scales. In the Chinese SF-36v2, Cronbach’s alpha exceeded 0.7 on all scales except social functioning (Cronbach’s alpha: 0.68). For known groups validity, respondents with chronic medical conditions expectedly reported lower SF-36v2 score on most English and Chinese SF-36v2 scales. In confirmatory factor analysis, the Singapore three-component model was favored over the United States two-component and Japan three-component models.

Conclusions

The English and Chinese SF-36v2 are valid and reliable for assessing HRQoL among English and Chinese-speaking Singaporeans. Test–retest reliability and responsiveness of the English and Chinese SF-36v2 in Singapore remain to be evaluated.

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