The trial will be analyzed according to the intention-to-treat principle. The effect of treatment with Ziprasidone will be assessed by analyzing changes in the score of the scale described above. Changes calculated from the evaluations before and after treatment will be analyzed by means of analysis of covariance, considering the baseline measurement as a covariate. The difference between treatment groups will be estimated with a 95% confidence interval and will be tested within this model by the corresponding two-sided test at the 5% level of significance.