Covariance Model*
  Random Intercepts Exponential Gaussian
-2LL -10085.3 -11176.3 -11108.5
AIC -10059.3 -11146.3 -11078.5
EP 10.3214 13.0746 12.9565
AICadj -10064.66 -11150.15 -11082.59
*Results were obtained for Model (1.3), which assumes mean response functions for groups differ by quadratic trend. Demographic and clinical characteristics included as covariates.
Table 3: Covariance model selection for the semiparametric mixed model (1.3) applied to twenty-four hour diastolic blood pressure.