Results of multivariate linear regression models.

Note: a: Model I, in which EQ VAS was the dependent variable, and 13 classes of chronic diseases and socio-demographic and health behavior variables were independent variables;b: Model II, in which EQ VAS was the dependent variable, and co-morbidity and socio-demographic and health behavior variables were independent variables;c: Regression coefficient (linear relationship) indicating the difference in EQ VAS score comparing each subgroup to the reference;d: SE, standard error.