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Exploring the consistency of the SF-6D
Lara N Ferreira1, Pedro L Ferreira, Luis N Pereira
1University of the Algarve-ESGHT, Faro, Portugal; Centre for Health Studies & Research, University of Coimbra, Coimbra, Portugal.
The six-dimensional health state short form (SF-6D) should be derived from the SF-36 health survey, not used independently. This ensures consistent health utility index values and avoids discrepancies across sociodemographic groups.
Area of Science:
- Health Economics
- Psychometrics
- Health Outcomes Research
Background:
- The six-dimensional health state short form (SF-6D) is designed for derivation from the SF-36 health survey.
- Assessing health utility values is crucial for health economics and outcomes research.
Purpose of the Study:
- To compare SF-6D index values derived from the SF-36 (SF-6DSF-36) with those from the SF-6D administered independently (SF-6DInd).
- To evaluate the consistency of respondent answers between these two SF-6D derivation methods.
Main Methods:
- A sample of 414 Portuguese individuals participated.
- Agreement was assessed using descriptive systems, global consistency, and identically classified indexes.
- Correlation coefficients and parametric tests identified differences and relationships between the SF-6D index values.
Main Results:
- SF-6DInd yielded higher values than SF-6DSF-36, with significant sociodemographic differences.
- A ceiling effect was observed in SF-6DInd but not SF-6DSF-36.
- High, yet lower-than-anticipated, correlation was found; two dimensions showed considerable differences.
Conclusions:
- The SF-6D is intended for derivation from the SF-36 and should be utilized in this manner.
- Using SF-6D as an independent instrument may lead to inconsistencies and is not recommended.
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