Validity of SF-12 summary scores in a Greek general population
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BioMed Central
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Validity of SF-12 summary scores in a Greek general population Nick Kontodimopoulos*1, Evelina Pappa1, Dimitris Niakas1 and Yannis Tountas1,2 Address: 1Hellenic Open University, Faculty of Social Sciences, Riga Fereou 169 & Tsamadou, Patras 26222, Greece and 2Center for Health Services Research, Department of Hygiene and Epidemiology, Medical School, University of Athens, 25 Alexandroupoleos St., Athens 11527, Greece Email: Nick Kontodimopoulos* - [email protected]; Evelina Pappa - [email protected]; Dimitris Niakas - [email protected]; Yannis Tountas - [email protected] * Corresponding author
Published: 28 September 2007 Health and Quality of Life Outcomes 2007, 5:55
doi:10.1186/1477-7525-5-55
Received: 23 June 2007 Accepted: 28 September 2007
This article is available from: http://www.hqlo.com/content/5/1/55 © 2007 Kontodimopoulos et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract Background: The 12-item Health Survey (SF-12) was developed as a shorter alternative to the SF-36 for use in large-scale studies, particularly when overall physical and mental health are the outcomes of interest instead of the typical eight-scale profile. The main purpose of this study was to assess the validity of the Greek version of the SF-12. Methods: A stratified representative sample (N = 1005) of the Greek general population was interviewed. The survey included the SF-36, the EQ-5D and questions on socio-demographic and health-related characteristics. SF-12 summary scores were derived using the standard US algorithm. Factor analysis was used to confirm the hypothesized component structure of the SF-12 items. Construct validity was investigated with "known groups" validity testing and via convergent and divergent validity, which in turn were assessed by the correlations with the EQ-5D dimensions. Concurrent validity was assessed by comparisons with SF-36 summary scores. Results: SF-12 summary scores distinguished well, and in the expected manner, between groups of respondents on the basis of gender, age, education, socio-economic status, self-reported health problems and health services utilization, thus providing evidence of construct validity. Effect size differences between SF-36 and SF-12 summary scores were generally small (18 years old) residing in urban (>2,000 inhabitants) and rural (0.50 were regarded as strong [30]. For all tests, statistical significance was assumed for P values
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