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New model to explain the EQ-5D VAS in patients who have undergone spinal fusion
Jorge Cortés1, Juan F Blanco, David Pescador
1Departamento de Matemática y Estadística, Facultad de Ingeniería, Ciencias y Administración, Universidad De La Frontera, Mailbox 54-D, Temuco, Chile. jcortes@ufro.cl
Background:
In the health sector, the EQ-5D has been widely used to evaluate health-related quality of life, mainly due to its simplicity, robustness and plasticity in calculating years of life adjusted for quality.
Methods:
However, its model has remained stable over time and knowledge of the influence of such biodemographical variables as age and gender has not been incorporated. This information, along with the well-known non-linear behavior of the VAS, which measures the self-concept of the 'General State of Health', forms the basis for a new model, which we present here from a sample of patients who were operated on for chronic low back pain.
Results:
These are obtained using multiple regression analysis are consistent in terms of goodness-of-fit given that this new model is able to explain 91.3% of the self-concept of the 'general state of health'.
Conclusions:
Above leads to an improvement of 21.6% compared to the available models more robust and meets most of the restrictions for this type of statistical modeling.