Is the SF-12 version 2 Health Survey a valid and equivalent substitute for the SF-36 version 2 Health Survey for the Chinese?
Article first published online: 29 NOV 2011
© 2011 Blackwell Publishing Ltd
Journal of Evaluation in Clinical Practice
Volume 19, Issue 1, pages 200–208, February 2013
How to Cite
Lam, E. T. P., Lam, C. L. K., Fong, D. Y. T. and Huang, W. W. (2013), Is the SF-12 version 2 Health Survey a valid and equivalent substitute for the SF-36 version 2 Health Survey for the Chinese?. Journal of Evaluation in Clinical Practice, 19: 200–208. doi: 10.1111/j.1365-2753.2011.01800.x
- Issue published online: 25 JAN 2013
- Article first published online: 29 NOV 2011
- Accepted for publication: 24 October 2011
- health-related quality of life;
Rationale and objectives The scoring algorithm of the 12-item Short-Form Health Survey (SF-12) was revised in the second version (SF-12v2), but information on its psychometric properties is lacking. This study determined whether the SF-12v2 was a valid and equivalent substitute for the SF-36v2 Health Survey (version 2) for the Chinese.
Methods A total of 2410 Chinese adults in Hong Kong completed the SF-36 Health Survey by telephone. The SF-12v2 data were extracted from the SF-36 data. Internal consistency was assessed by Cronbach's alpha, and test–retest reliabilities were evaluated by intraclass correlation. Criterion validity and equivalence were assessed using the SF-36v2 scores as a gold standard. Construct validity and sensitivity were assessed by known-group comparison.
Results Internal consistency and test–retest reliabilities were good (range 0.67–0.82) for all except three scales. The SF-12v2 summary scores explained >80% of the total variances of the SF-36v2 summary scores. Construct validity and sensitivity were confirmed by significantly lower SF-12v2 scores in people with chronic diseases than those without. Effect size differences were less than 0.3 and relative validities were greater than 0.7 between SF-12v2 and SF-36v2 scores for different groups.
Conclusion The SF-12v2 was valid, reliable and sensitive for the Chinese. It is an equivalent substitute for the SF-36v2 for the summary scales.