The use of 1 year as a minimum time period for inclusion of a study in the review was reasonable. However, tardive dyskinesia can occur for many years after treatment. Furthermore, many of these studies did not adequately assess acute-onset movement disorders—including parkinsonism, acute dystonia, and akathisia—that can increase the long-term risk of tardive dyskinesia. Of these, parkinsonism is particularly important for predicting the risk of tardive dyskinesia because it is associated with the masking of dyskinesia. Finally, in some of these studies, patients were treated with concomitant medications that can suppress dyskinesia.