方法采取整群抽样方法，抽取某省级医院1994年至2 0 0 0年伤害病人病案，进行平均住院日、平均住院费用趋势性分析。
Methods Cluster sampling was taken, and average hospitalization days and average medical cost of injury patients from 1994 to 2000 were conducted by trend analysis.
方法采取整群抽样方法，抽取某省级医院1994年至2 0 0 0年伤害病人病案，进行平均住院日、平均住院费用趋势性分析。
Methods Cluster sampling was taken, and average hospitalization days and average medical cost of injury patients from 1994 to 2000 were conducted by trend analysis.
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