Test for the difference of the agranulocytosis report rate between clozapine and olanzapine in the FDA adverse event reporting system (AERS).

*Chi-square test for the equal rate of agranulocytosis between CLZ and OLZ. AERS records were updated in September, 2009.*本研究采用卡方检验（Chi-square test）以检验氯氮平（CLZ）与奥氮平（OLZ）的粒细胞缺乏症（agranulocytosis）发生率是否相等。所用不良事件报告系统（AERS）的记录于2009年9月完成更新。