Cross-validation of item selection and scoring for the SF-12 Health Survey in nine countries: Results from the IQOLA Project

Barbara Gandek, John E. Ware, Neil K. Aaronson, Giovanni Apolone, Jakob B. Bjorner, John E. Brazier, Monika Bullinger, Stein Kaasa, Alain Leplege, Luis Prieto, Marianne Sullivan

Research output: Contribution to journalArticlepeer-review

Abstract

Data from general population surveys (n = 1483 to 9151) in nine European countries (Denmark, France, Germany, Italy, the Netherlands, Norway, Spain, Sweden, and the United Kingdom) were analyzed to cross-validate the selection of questionnaire items for the SF-12 Health Survey and scoring algorithms for 12-item physical and mental component summary measures. In each country, multiple regression methods were used to select 12 SF-36 items that best reproduced the physical and mental health summary scores for the SF-36 Health Survey. Summary scores then were estimated with 12 items in three ways: using standard (U.S.-derived) SF-12 items and scoring algorithms; standard items and country-specific scoring; and country-specific sets of 12 items and scoring. Replication of the 36-item summary measures by the 12-item summary measures was then evaluated through comparison of mean scores and the strength of product-moment correlations. Product-moment correlations between SF-36 summary measures and SF-12 summary measures (standard and country- specific) were very high, ranging from 0.94-0.96 and 0.94-0.97 for the physical and mental summary measures, respectively. Mean 36-item summary measures and comparable 12-item summary measures were within 0.0 to 1.5 points (median = 0.5 points) in each country and were comparable across age groups. Because of the high degree of correspondence between summary physical and mental health measures estimated using the SF-12 and SF-36, it appears that the SF-12 will prove to be a practical alternative to the SF-36 in these countries, for purposes of large group comparisons in which the focus is on overall physical and mental health outcomes.

Original languageEnglish
Pages (from-to)1171-1178
Number of pages8
JournalJournal of Clinical Epidemiology
Volume51
Issue number11
DOIs
Publication statusPublished - Nov 1998

Keywords

  • Construct validity
  • Cross-cultural comparisons
  • Health status indicators
  • SF-12 Health Survey
  • SF-36 Health Survey
  • Translations

ASJC Scopus subject areas

  • Medicine(all)
  • Public Health, Environmental and Occupational Health
  • Epidemiology

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