Demographic characteristics by response status and response time.

Note: total n is not the same for VFC status and mean daily number of patients due to item specific non-response.*Means and standard deviations are given for continuous variables, counts and percents for categorical variables.**P-Values reported in this column are group tests. For example, the P-Value reported for type of practice compares the model including practice type variables to the one not including practice type variables by likelihood ratio tests.***P