Among all the hospital costs in these four individual years,the most expensive was at-tributed to prosthesis cost,reached as54.7%,56.1%,56.0%and63.3%of total costs respectively.

• 下降幅度最大的是床位费和输血费。 四个年度的各项费用中所占比例最大的是假体费；分别为54.；7%25、56