Patients and methods: Of total 2420 patients was surveyed retrospectively, the factors of sex, age, specialty, days of admission, and the pattern of use of psychotropic agents were analyzed.

• 病人及方法：本次研究采回溯法，总共有2420个住院人次被纳入本次研究中，就个案的性别、年龄、住院科别、住院天数、第几天开始使用精神作用药物以及住院期间是否有会诊精神科等变数加以分析。