Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research
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Multicenter Study Comparative Study
Modeling Health State Utility Values in Ankylosing Spondylitis: Comparisons of Direct and Indirect Methods.
Cost-effectiveness analyses of technologies for patients with ankylosing spondylitis frequently require estimates of health utilities as a function of the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and the Bath Ankylosing Spondylitis Functional Index (BASFI). ⋯ These results add to a body of evidence that the statistical model used to estimate health utilities matters. Linear models are not appropriate. The four-class bespoke mixture model approach provides the best performing method to estimate the EuroQol five-dimensional questionnaire values from BASDAI and BASFI.