To shorten the averaged length of stay (ALS) is of issues about utilization of resources at both levels of hospital and the whole health care system (HCS).

• 缩短平均住院日是一个关于卫生资源利用效率的问题,既有微观层次医院水平的效率问题,又有宏观水平整个卫生系统的效率问题。