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.