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En Raschanalys för att jämföra två svenska översättningar av en enkät som mäter hälsorelaterad livskvalitet
Linköping University, Department of Computer and Information Science.
Linköping University, Department of Computer and Information Science.
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

During the 1980’s the non-profit organisation RAND Corporation conducted the two-year Medical Outcomes Study with the goal of creating a comprehensive medical questionnaire. The resulting 116-item questionnaire measures health related quality of life (HRQoL) topics such as physical, mental and general health. The questionnaire is available as a free resource on their web page. SF-36, which contains 36 of these questions, is distributed for a fee by the US company Quality Metric Inc. The company has translated the questionnaire into several languages, including Swedish, and has also taken license for the translations. Registercentrum sydost has made a new Swedish translation of the same questions as in the SF-36. This survey is called RAND-36 and is license free. Because Quality Metric Inc has taken license for its Swedish translation, the surveys are similar but not identical.

This study aims to compare the aforementioned HRQoL-instruments to determine whether it is possible to replace the licensed questionnaire SF-36 with the license free RAND-36.

The distribution of items with response options according ordinal scale were compared with Mann-Whitney U-test. The test yielded a significant difference for eight items in the measure PF(physical functioning), MH(mental health), VT (vitality) and GH (general health perceptions). The distribution of items with response options according dichotomous scale were compared with X2-test. The test yielded significant difference for an item in the measure RE (emotional role functioning).

The reliability of questionnaire was compared with ordinal alpha. In the selection the reliability between MH and VT is equivalent. The biggest difference between the surveys is the measure RP (physical role functioning) where the RAND-36 meets the requirement that the measure can be used for reliable conclusions on the individual level, which is a condition that SF-36 can’t met.

The probability of entering an answer, given the respondent's ability, was compared with Rasch analysis. Wald's test gave DIF between most items within the measures PF, MH, VT and GH.

Place, publisher, year, edition, pages
2016. , p. 69
Keyword [en]
Rasch analysis, item response theory, SF-36, RAND-36
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:liu:diva-130598ISRN: LIU-IDA/STAT-G--16/009--SEOAI: oai:DiVA.org:liu-130598DiVA, id: diva2:953520
Subject / course
Statistics
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Examiners
Available from: 2017-01-09 Created: 2016-08-17 Last updated: 2017-01-09Bibliographically approved

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Probability Theory and Statistics

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CiteExportLink to record
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Citation style
  • apa
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